Jeep Gladiator - Do 35"s kill gas mileage and performance?
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- čas přidán 28. 12. 2020
- Ever wondered how much bigger tires hurt your gas mileage and performance? I did some testing with my stock tires/wheels vs my 35" Nitto Ridge Grapplers and 17x8.5 Icon wheels. Did a 50 mile hwy gas mileage loop and some timed 0-60 runs using my Tazer mini.
Music: Rocky Top by Jason Shaw
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Thank so much for this post , I am now a fan of your content. I also have an overland trim and I fond it difficult to find posts that aren't for the sport or Rubicon model.
Awesome, it's always nice to hear the content was helpful to someone. Thanks for watching!
Man thank you so much for real world test and all the data. Out of every video and forum chat I have seen so far, this is by far the most informative. Kudos big time man and thanks again! I just bought a 2021 High Altitude and was researching all over the place for this exact info. You saved me alot of heartache lol. Instead of rushing out to get new rubber, I'll just wait until I can re-gear at the same time as most of my driving will be highway.
Happy to share! I know what you mean, so much of what's posted on the forums is fairly subjective opinions... one person thinks it's no big deal, vs someone else who thinks it is terrible. I'd rather see some data and decide for myself. I love the way the lift and 35"s look, but they definitely had an impact on gas mileage. Congrats on the new Jeep btw!!
Hi. Just curious if you used a Pro Cal or similar to readjust shift points etc?
I learned nothing from this. Did a final MPG get told?
That was way more than I thought. Great video. Only seen one others like this but it was with rehearing. This amazed me. Thanks so much...nice video..!
Glad the video was helpful. Yea, the size/weight of the tires really has an impact. Though in all fairness, the fact that you can run 35"s without gearing and still get reasonable gas mileage is impressive. I think back to my XJ on just 31"s and was probably getting similar gas mileage. It would have been a dog with 35"s haha.
Great info! Thanks for putting in the time and effort.
Glad it was helpful! Thanks for watching!
Thanks for the vid! The physics explains it all, and you can probably even test the concept. It's not just about the increase weight; it's about where the weight IS in proportion to the axle. The further away from the hub that the weight goes, the harder it is for a wheel assembly to be twisted. For an extreme example, you can use a barbell and a dumbell. If you held a 40 lb dumbbell in your hand, and tried to twist it from palm down to palm up, it seems relatively doable. However, if you had a 20 lb barbell and 20 lbs of weight on it and you tried to do the same thing, it would be much more difficult. This is what happens when you put on taller tires. Even if the whole assembly was the same weight, it would still be more difficult to twist and thus use more power.
I just bought the Overland, and will be doing lots of highway driving with some light to moderate offroading maybe twice a month. I'm now thinking that 33's might be the way to go for mostly being a daily driver. Thanks for doing all the work to get the info.
Happy to share. And congrats on the new Overland!
Just ordered a '22 Overland and had the same thought. For our use, 33" seems the way for us to go. Thank you.
I'm thinking of 32s on mine.
I totally agree.....this changed my mind about going with the 35's
255 70 18, if that is factory, is already a 32.
Thanks for doing this and providing the information. Consider also testing for the effect on braking distance.
I agree, it would be interesting to know how much impact the tires had on braking distance. While I can't say that in normal daily driving that I've noticed any real difference in braking, the reality is that heavier/taller tires will certainly increase braking distance. I have also towed an 8.5x16 enclosed trailer with my race car in it without any issue, though the trailer has trailer brakes, and I installed a Redarc trailer brake controlled.
Great info! Just ordered 35s with the same tires you used and appreciate the detailed comparison!
Congrats on the new tires. I think you’re really going to enjoy them!
Excellent video, you scienced the hell out of it. Nice job!
Glad it was helpful. Thanks for watching!
Thank you I'm about to pick up my rubicon and was also worried about handling at freeway speeds. You didn't complain about that. Wonderful video and I'll keep the stock 33 " never wanting to get bigger meats
It's not exactly sports car handling on the highway, but it's good enough. On the 2020 models like mine, they have a TSB for an updated steering gear box, which I have since gotten. My understanding is that all 2021 model were built with the new gear box. Since your Rubicon will have 4.10's and stock 33"s, you shouldn't have any gearing issues at all! And congrats on the new ride! Thanks for watching.
Just got my 2021 gladiator Rubicon the PSI on both the rear and front was set at 37, it bounce all over the place. I messed with it a little, I air down to 33 and made a huge difference. Rides like a Cadillac now…..well not really, but it’s a lot smoother ride.
Awesome test and video. Keeping my stock 33” Mojave tires for now. Gas mileage is already lousy.
Very thorough and organized video…. Subscribed!
Thanks for watching and subscribing!
I know this is an old video, but very helpful.
When I bought my Gladiator it already had a lift and 35 X 12.5 mud tires installed. It was getting 14.9mpg in city driving.
When I bought the Jeep I was mentally prepared for poor mileage. But, you watch these Jeep channels and they go a little crazy with the lifts and tires.
The 35s were fun, but kind of ridiculous.
I scored some wheels/tires off Craigslist from a guy who just bought a Mohave and had immediately bought 35s. Since installing those I get between 16.5 & 17.1 mpg around town and ~21 on the highway.
This is acceptable to me and about as small as I realistically can go considering anything smaller with the MOPAR lift would look ridiculous.
They actually measure out to 32.5 by my measurements.
On another thread someone said they got 10mpg with different gears and 40s. That's about $1 per mile! 🤪
Thinking about putting these on my Mini Cooper. Thanks for the vid! 😃
Thank you for putting in all that work!!!! Much appreciated!
Excellent video!
Thanks. Been trying to decide on changing from stock on my Silverado. This helps a lot
Glad I could help. Thanks for watching.
It definitely helped. So many people on the forums and Facebook talk about not needing to regear for 35s. I feel like I wasted my money buying 35s and still needing to change gears. Wish I had seen this before, i would have just got 37s and 4:88s.
If you start off with the 4:10 35 is fine. I think it’s more of a function of his 3:78 gearing
I'm running 4.10 gears with 35s. I do see 8th frequently on flat roads, but any incline and it often drops to 6th. I was averaging 15.8 to 16.5 during the summer with very little highway. I'm getting around 13.6 - 14.4 now. I'm not going to regear, because I don't think it would be a huge difference coming from 4.10. Since you have the 3.73 ratio and want to stick with 35s, I'd recommend 4.56 gears. That would probably be the sweet spot for 35s.
I agree. While the 4.10's still aren't ideal either, they are incrementally better than the 3.73's. At the moment though, especially since I'm not commuting to work because of Covid, it really hasn't bothered me that much. Even pulling my 8.5x16 enclosed trailer, it's not the end of the world. It runs in a lower gear and turns higher rpm, but again, it's not something that I'm doing very often at the moment. But I do eventually see going to either 4.56 or 4.88 gears. Or trade it in for a diesel, haha.
Great video. Excellent job!
Thanks for watching!
Fabulous data! Thank you for the test! Might I ask how you recommend tire rotation for the 35" tires? [1] A simple front to rear and rear to front move or [2] X the fronts to the rear and a simple rear to front move. Many Thanks!
Great Video! I always thought that bigger tires hurt MPG but I never knew how much. Thank you!
When ego goes up, might goes down. Perfectly balanced, like all things are
Thanks for the great information in this video. I have a Rubicon with stock tires and 4.11 gears and out here in Southeast Oregon at 5000' I am getting about 20 MPG but the truck is new. I was thinking of going to the 35's but I think I will stay with the stock tires and see how my truck works after the install of the Tazer Mini. Thanks again for the great video and info!
I don't regret going to 35"s. I think they look awesome. But the extra height and weight definitely has an impact on fuel economy. but since you have the 4.10 gears, that should help some.
I purchased my gladiator with the Mopar lift and 37s. I live in Las Vegas and took a trip to Wisconsin last year, 26 hours. I got an average of 14 miles to the gallon. Since then all I took the fenders off and put fender flares from nemesis industries. This year I again took that trip to Wisconsin and my gas mileage was 17 miles to the gallon.
Nice, 17mph with 37"s isn't bad at all. I wonder if the improvement came from the motor breaking in some, and maybe the new fender flares are more aerodynamic?
Great video, thanks for doing it!
Thanks. Very useful your videos. These are the type of information I am searching for now in order to decide if going for 35 or 37. 35 will be.
If you go/went with 37’s you will never see 20+ mpg ever again
@@rocketman3776 I did. You are right. Never better than 16 and never 8 speeds. Thanks for your videos.
Great video! Time to regear!
Really good video. I have an 11 hr drive from PA to to Southeastern corner of NC. I would like to do exactly what you did with the tires but the gas mileage thing concerns me greatly. Have you taken it on any trip longer than one hour yet with the 35’s
Yea, the gas mileage is definitely something to consider. I've done a few longer trips. Went for NC up to DC to pick up my race car, and took an overlanding trip to the NC mountains last year. But both of those trips I was towing a trailer so not the best comparison on gas mileage. I have just over 6k miles on the Jeep now. No real change in the gas mileage. Average 13-15mpg mixed driving.
Looking to buy my first jeep and no I will not keeping it stock. Was looking at 35s but 33s might be the right move. Thank you the great video!
Congrats, you'll love your new Jeep. I don't honestly still really love my 35"s but that increase in tire size doesn't come without some sacrifices. I saw another Gladiator on the highway this weekend, it looked like he had a leveling kit an 33"s, and it also looked really good. Can't go wrong!
Good tests.
What most people miss in tires is that the tread and the width have more of an impact on energy/fuel consumption than diameter.
Tire/wheel weight has a larger impact on 0-60 times not so much highway cruise economy
No we used to put under drive and weight reduction pullys on camaros, firebird's, mustangs. There is a drag race formula
I'm old now so can't remember exactly but basically ever pound you take off of an object like the wheels, pullys drive shaft it's equal to 8 pounds of weight on the car. If you add 20 pounds per wheel that's 80 x 8 pounds...so that's like throwing 640 pounds of shit in your bed and hauling it around
@@yamahansolo but that’s all for accelerating. Once at speed and not accelerating your only energy use is drag. Air drag and rolling resistance. That noise big wide mud tires make is all energy transfer from the tire lugs to the road and it’s a huge negative energy flow
Great video and information. I have been thinking about 285/75 18's. Good to know how the tire size will impact real driving conditions. The area I live has lots of hills and mountains. Think I will stay with a tire size that is closer to stock.
A 285/75/18 is a 34.8". So pretty much the same rolling diameter as most 35"s. Though obviously not was wide, which would save some weight. But bottom line, a taller/heavier tire will definitely have an impact on gas mileage. I love the way it looks, but it's not without a few drawbacks. Good luck on your decision!
I'm thinking of going with a 285/70/18 that's a 33.7 inch so I think it would be a good middle ground between size and mpg
Thanks for sharing.. much to be considered......
I run 35 inch BFG KO2s with a 2 inch MOPAR lift. I usually get 17.3 to 8 for town driving. On longer roads would probably get more with my jeep gladiator rubicon.
Great video very much appreciate all the information but please look into a bettee mic/ sound if you're going to talk in your garage
I have a 2021 WILLYS 373 gear 2.5 leveling kit and a set of rubicon’s 285/7018 which is 1 inch taller than the 255/78-18 stock willys tires that gives me 3.5 lift nice ride and 18-20 mpg.
Thanks for the confirmation on my findings. I've got a manual JL Wrangler that I just put 35's on. Around town it's not too bad, but on the highway it's painful. It's a six speed and I rarely get out of fourth. I can maybe do 5th if it's extremely flat for a long stretch. Sixth gear has become non-existent, both for highway and city. It's much more sluggish in both environments as well. Gas mileage went from about 22mpg to 17mpg. Highway mpg is worse than city. Kind of wish I had gone with 33's. But I'll be re-gearing as soon as I can come up with the $2,800 I was quoted for the job. To me, it's not really something I enjoy driving in it's current state.
Yea, I think the 8spd auto can mask it a little better, but the taller heavier tires definitely have an impact. A close friend just bought a JT with the 6spd and he's trying to decide what size tire he wants to go with. He's leaning towards more like a 34" tire since he's not in a position to regear in the near future.
That’s way too much for regear 😂
You have to light foot it if you want better mpg with bigger tires. The cruise and acc is quite aggressive in terms of speed and shifting.
I found I as doing so much highway driving, I just stuck with the original dimensions. You can still get very far with standard size with a good AT tire
I have the EcoDiesel and put 35s on it in the spring, went from 26.5mpg to 24.5mpg, got the Z chip and reprogramed the tires also, lets just say even to get 24.5 to 25mpg I am coasting to most stop signs, and I also manually put it into 8th gear at 45mph otherwise it does not go in until around 52-55mph.
Note: I travel county roads to and from work with a posted speed of 45, so I'm doing 50mph in 8th gear to get 24.5 -25 mpg
That's awesome. The torque of the diesel makes a huge difference. If I could change one thing about my Gladiator, it would be to have the ecodiesel.
Excellent analysis, thanks for sharing. Any update or changes you’ve had since this test to improve the mpg?
Not really any changes. For normal mixed driving I get a13-14mpg. And on long hwy trips I might get up to 17mpg.
great video. Recently purchased a 2020 glad sport s with max tow and it has 35s. Now my results are a tad different with the 4.10 gears. I average around 17-18 hwy at 70-75 mph. But overall not too far off from what you have with the 3.73..
interesting. I was going to buy the sport s with max tow, lift it 2 inches and put 285/75R17's on it, but get 2 more mods directly from mopar: The stainless steel cat back dual exhaust and the cold air intake with the washable filter. together I figured these 3 might work. however...2 weeks ago, ended up settling for a 2022 rubicon, just nothing else available where I live. 12 days in, throttle position sensor goes all crazy, command start fails, red warning light, uh oh, goto dealer, they scan it, cleaned some oil & water out of the air filter compartment. the senior electronics technician tells me its coming back through the pcv valve, jeep has no fix for this yet, its too new. but stay posted they might come up with a recall or a solution. its got 4:10 gears and 285/70R17's from factory. trip meter says 14.5 liters per 100 km up to 15 sometimes. window sticker says 12.3...havnt seen it yet...and this is sticking to 105km/hr. mostly hiway for now. so, the question is? would the exhaust and intake help either of us? the jeep technician told me flatly, he didn't think it would help at all. but I watch these vids and read the comments, cuz mabey someone tried it. dont know if this helpful to you any, have you made any changes since?
Did you adjust your speedometer before doing the test? Otherwise, the mpg on your infotainment is calculated wrong
I'm not an expert, but I believe that a new gearing setup would help out, a few mpg probably. Awesome 👍 🌞
always wondered, Thanks
Great real world comparison. So much better than all the other ones, “you’ll get worse fuel economy, you’ll go slower” okay cool thanks but how much impact?! This gave practical and actual results.
I’ve got a JLUR 2.0L and my 37s, on the same Icons, are sitting on my front patio while I’m out of state, don’t go steal them,! I we,t with the Wildpeak AT3W because I got them for $378 each, good deal. Looking forward to getting them on! Down the road I’ll be running 4.88s, probably sometime in ‘23 and I hear hat should give me 8th gear back on the freeway.
Thank u I needed all that info.
Awesome, glad the video was helpful. Thanks for watching.
I have 35’s on my JK. I can tell you that if you don’t use cruise control where you can control the shift up and down you only loose maybe 1 mile per gallon. You need to put up with some speed decreases on bridges and some over passes. Once you get the mass rolling it doesn’t take much effort to keep it rolling. Oh and by the way, I’ll take the lift, tires, weight and look over gas mileage every day of the week and twice on Sundays. I knew going in what I was after and what I was going to get. If one is after gas mileage, don’t buy a jeep. Buy a Geo
Good video and to the point
Glad you liked it! Thanks for watching.
I just got my Gladiator Willys almost a month ago. Now I wonder how much of a difference it would be to switch from the 33s to 35s with the same suspension set up. As is, I’m averaging 19 mpg which includes a combination of street and highway driving.
Did you make the switch to the 35’s? If so, how do you like them?
Great video. You covered everything except for braking? Do you notice any difference in stopping power now that you've added that extra mass to each wheel?
Excellent point. I didn't do any A-B testing to compare, but taller/heavier tires are definitely harder to stop (can't change physics). But daily driving it's not something that I've noticed. Even towing my 8.5x16 enclosed trailer (with trailer brakes), I don't have any issues with stopping power. I'm sure if I had done 60-0 stopping distances tests, I would have seen an increase in stopping distance. Or repeated 60-0 tests would probably produce brake fade earlier. But in normal driving conditions it's not something I notice at all. Hope that helps!
Good job going on a circle. That negates any wind effect, on both days of testing.
Thanks. And hopefully it helped eliminate any impact of elevation changes too. Thanks for watching!
How about the ride quality and road noises comparing with stock tires!
Thanks for the video. I have a sport S, with 3.73 gears and looking to put on 35s. This was super helpful!! Would you happen to know if 4.88 would help out with bringing up the MPG? Running 35s
The 4.88's may help some, but I don't think it would be significantly better. There's still the realities of poor aerodynamics and heavier rolling mass of the tires. 3.73 gears in 7th gear (0.84), would be very similar to 4.56 gears in 8th gear (0.67). So you're still turning similar rpm's on the hwy. So instead of running primarily in 6th and 7th gear on the hwy, you would run in 7th and 8th gear. But the rpm's the engine is running at would be similar. What you gain is more power in the lower gears though, so that's a benefit.
@@ScrufsGarage ok gives me a better idea if I really have to regear. Thank you👊🏽
Two things that might help:
1. For 35s and the V6 4.56 would be more appropriate, my 2Dr gets 21mpg with 37s and 4.88
2. Spend the money on lighter wheels. Not much you can do about the tire, but keeping unsprung weight down will help immensely
TrailRecon did a video and real world test with re gearing, worth watching, good discussion during the test about all those factors too.
Good video.
thats whatg i do i use manual mode when up to spped n leave in 7th id rather manual shift it then the trans slaming back n fourth between gears
I’m averaging 17.5mpg for my 22 Mojave stock 33”.
It isn’t as bad as it seems. Believe it or not I use my gladiator on 35’s for 8hr shift of grubhub once a week (I know crazy but it’s only a jeep). $35 gets me half a tank and it lasts me all day!!!!!
Wouldn't the larger tires throw off the miles traveled on your second trip since they would have fewer revolutions than the stock tires, or did you recalibrate your odometer to account for the larger tires?
I’m using a Tazer mini to recalibrate the speedometer. So the tire height difference is accounted for between the tests. 👍
Good stuff and a big difference on the mileage, let us know if you are going to re gear and what gears are you going to use if so
Yea, the motor just has to work so much harder on the highway, and you really see it in the gas mileage. I haven't decided yet if/when I'll regear. It partly depends on if I think I'll eventually go to 37"s, or if I'll stay with 35"s. I would lean towards 4.88 gears, though they would be a bit aggressive with 35"s. So basically I'm undecided at the moment, haha.
4:88’s for sure, I have JLUR on 35’swhich came with 4:10
I went to 4:88’s on 35’s on my JLUR. It didn’t help much with gas mileage, you do get 7th&8th gears back!
Thanks for sharing, i have a 2022 Mojave and was thinking bigger tires and lift, but i use mine as a DD, so 15MPG sucks for me. lol. I am thinking about a AEV 2 inch height spacer. At least that way i get a lil more clearance on my stock 33s Wild Peaks. thoughts?
You don’t need a lift for 35’s on a Mojave let alone a 2” spacer for the stock wildpeaks.
I just got 35” Maxxis (11” width) and they’re perfect.
Im gonna get a flashcal by superchips when i goto 35s..i had realy good luck with superchips on my jk…..reprograming the speedo….and changing the shift points
I've got a Tazer mini and have been happy with it. Aside from recalibrating for tire size, it also lets you turn off the autostop engine shutoff, and various other things (double tap mute to turn on the rear camera, can activate the rear camera when you use your turn signals, etc). Might be worth considering also.
On my old ford 150 Van putting bridges stone the tallest tire and about12 “ wide lot of thread. The mpg dropped from stock 13 mpg to under , I was putting 40-50 buck a week here gas 4. 50 now. Iv bought a transit 250 iam not going back to the TA Iam useing 18- 30 buck a week now. It’s the aggressive thread that make that sound its really scrubbing the road , I brought a eco meter it show coasting vs gas in real time. Try double tap the trottle t make the Tran shift early , but that low speed .
Need to change axle gear size to compensate
33" Falcons I get 19 AVG on longer trips doing 75 ...holding off until the Falcons need to be replaced before I decide if 35's have any value add for me! -- going to be puling a 3500 lb camper for 400 miles next Saturday! guessing I'll be closer to 10 MPG!
How well does it pull your camper?
What was your mileage with the camper?
@@glenwoolsey4698 11MPG ---will be doing 2200 MILES starting second week of August on 35x12.5s so that should be quite costly
@@DeanJohnson67 True but life3 is fun and what you make of it. I have a Gladiator max tow 31.5's and it is my main tow vehicle for my RV 3000lb empty. Like 33's or 25's but taking my time to think about it.
What motor do you have?
With 38’s I’m getting at best 12mpg for hwy. sooo definitely a huge hit. Stock I was getting around the same, 23 mpg. Now I switch out my tires depending if I off road or not. Saves the tread life too.
that is almost 50% :)
Did you calibrate the ecu for the different wheel size prior to performing the tests with the new tires if kot than both fuel economy and 0-60 are inaccurate and thus compromised tests
Yes, using a Tazer mini to recalibrate the tire size.
Is this with the 3.6 motor ? Great video
Yes, mine has the 3.6L motor. I suspect the 3.0L diesel would handle bigger tires much easier
My 2000 dodge ram 5.9 magnum has 3.55 gears and 35s. I disabled OD and removed all the parts because the OD causes problems on the 46re transmission. I lost about 2 mpg on the highway which is a lot but its better for durability. I'm getting 12 mpg average and 16 mpg at 60 mph at 2000 rpm.
That's why got a stick shift Trans in my jeep never have to worry about an automatic trans becoming self aware, also much more control when rock crawling
I have a JTR on the 2inch molar lift and combined highway and city my average mpg stays above 20.5 and constantly stays at 21 mpg. What’s worked for me is staying in third gear in elavation at around 2500 rpm and on flat service not going over 2200
That's really good. A few weeks ago I drove from NJ to NC, and was going slower than normal since I had a motorcycle carrier on the bike, so I averaged under 65mph down I95. I got 17.5-18mpg on that trip, which is the best I've recorded. Going a little slower definitely made a difference.
Yes these machines are not made or intended for spirited driving unless there’s a 392 lol. Also they recommend a fuel of 89 or higher to help with the better mpg. I use 93 it apparently Can also keep your engine from the notorious Jeep ticking that they’re known for. I commute 2 hours a day round trip to help put perspective to it
35 inch on my 21 JL gears 4.56. I get 11 or 10.8 mpg city driving in winter. 15 is the best in summer.
Did you recalibrate the speedometer after installing the 35's? If not, then you were actually running faster than speedometer was indicating.
Speedometer was recalibrated using a Tazer Mini.
Great info
Glad it was helpful! Thanks for watching.
@@ScrufsGarage :) greetings from Honduras
Programmer will help with tire size calibration and shift points.
I’m using a Tazer mini for calibrating the speedo for the tire size change. has some useful features (disable auto stop for example) but doesn’t add any horsepower of course.
did you recalibrate the speedo? that might affect your numbers
Yes I did. I’m using a Tazer mini.
Great vid. Explains a lot and shows that you don't have to re-gear your Jeep when you up to 35s. I think some engine mods would help with gas mileage on the highway but for daily driving around town that setup is perfect.
Glad the video was helpful. Thanks for watching!
Was the speedometer calibrated?
I would think that it wouldn’t be accurate without calibration 🤷♂️
Yes, that's correct. For the taller tire size, I used my Tazer mini to recalibrate the speedometer. It also does the timed 0-60 runs, etc.
Have a Rubicon w/4.11, just wondering if that will make 35's a little more compatible...?
Yes, the 4.10's should be slightly better than the 3.73's.
Any update on the fuel economy or drivability of the 35s now that you have had them for a longer period of time?
I've got right at 6k miles on the Gladiator now. When I filled up yesterday (mixed driving) I think my average was around 14mpg. It typically varies from 12-15 mpg depending on the type of driving. So I have not really seen any real change in the mpg since putting the tires on. (I have since added a HD front bumper and a winch, so a bit of added weight). While I don't love how much it downshifts on the hwy, it's not really the end of the world. It's still very driveable. Regearing would be a "nice to have" but at the moment I don't think it's "required" if that makes sense.
@@ScrufsGarage Have you or have you considered programing you jeep for the 35's? To help shift points
@@jasonmatheney9425 Yes, I am running the Tazer Mini to recalibrate for the 35"s. (testing in the vide was done with the Tazer installed).
Have you considered re gearing to bring it back to a stock feel?
Truck U showed a kit from Baxter Performance for the Gladiator that prevents the engine oil drain back issue. 30 minutes after shut off all the engine oil drains back to the crankcase, even the filter is bone dry. Every start up is a dry start.
Interesting, I'll have to look that up. Thanks for the suggestion!
Biggest effect of bigger tires on fuel mileage is the extra rotating weight
You mentioned the transmission may need to relearn. Any repair shop with an Autel scan tool can make the transmission relearn it's adaptives. I reset mine. I work as a Mechanic.
I have about 15k miles on the setup now. Honestly no change in the shifting. Like anything, you get used to it after a while. I towed my enclosed trailer and race car to the track a few times, and it does what I need it to do. Overall I'm happy with it.
What lift / jack were you using I want that!!!
That's my Quick Jack! Love it. Very helpful for getting various vehicles up in the air for doing work. I did a video on it here; mostly about the initial setup, but you can see how it works, etc. czcams.com/video/ukmZFwbRotM/video.html
I’m sorry if I missed it but what size lift do you have ?
I went with a Rusty's off-road 2" lift. I talk about the lift in more detail in this video if you are interested. czcams.com/video/yCeFm7L_ncA/video.html
Did you re-calibrate your speedo when you switched to the 35"s? would register different on the 0-60 and fuel mileage test.
Now that it has been a full year, how many miles per gallon would you say is your overall loss with the tire size?
Mixed driving around town I’m averaging 13-14. I did a long road-trip, mostly interstate driving, and I got about 17.5 mpg.
@@ScrufsGarage how does that compare to your previous tires would you guess?
Did you recalibrate the speedometer when you put the 35s on?
Yes, using a Tazer mini to recalibrate for the tire size change.
Any update on the mileage? Is it still the same or has the computer adjusted the shift points to compensate?
I have about 4,500 miles on the tires now. And I'm using a Tazer mini to recalibrate for the tire size. I have not noticed any changes in the shifting. It still downshifts frequently on the hwy and often holds a lower gear much longer than seems necessary and so the gas mileage is still around 15mpg. The 3.6L motor makes peak torque at 4,400 rpms so I guess it's not surprising that the transmission needs to downshift and run the motor at a higher rpm. The motor makes plenty of power, it just comes at a higher rpm.
@@ScrufsGarage hmmm, now I’m considering 33’s over 35’s. I think gas prices are going to go sky high, in the near future.
Yea, it's definitely something to consider. The bigger tires add a lot of rolling mass. Another popular option is a leveling kit and running 285/75/17 tires. Roughly a 34" tire. And they weigh about 10 lbs less. (assuming a Ridge Grappler).
I have 33inch and I get 21-22 mpg on ko2
That too any vehicle you put larger tires on
How about breaking performance with the larger tires? Thanks
Braking performance isn't something I was able to measure, but realistically a taller heavier tire will have some impact on braking performance, especially under repeated hard braking. In a day to day setting, I can't say I've noticed a change. I didn't do any towing when my Jeep was stock, but since the lift and tires I towed my 8.5x16 enclosed trailer with the race car in it several times and didn't have any issues with braking. (the trailer had its own brakes).
You must have recalibrated your speedometer or your speed would have been way high with the big rubber?
Correct, I’m using a Tazer Mini to recalibrate for the tire size change.
I’m getting some 37s
Nice video and analysis. I have a Sport S with 4:10 gears, 2 inch lift and 35 Baja MTZs. I get 15.5 Hwy when going about 75. 8th gear half the time but 7th the other half. 700 mile trip from hills to flat so its a good mix. If i went with an A/T tire I could get better gas, or go with 4:88 gears and get better gas. 3:73 is just to tall for 35s IMO.
I had debated on going with 35"s vs 37"s. I'm glad I went with 35"s. The 3.73 definitely aren't ideal. They get it done, but regearing would be nice. 4.88's may be in my future. With Covid and work from home, I'm not driving it that much, so it's not a pressing issue at the moment. I really wish Jeep would offer the max tow (ie 4.10s) with the Overland model. I wanted some of the creature comforts that come in the Overland model, but it comes at the sacrifice of getting the max tow and 4.10s.
I noticed you didn't talk about re gearing, so if you did re gear would you still have drop that much mpg
In my opinion, the 8 speed largely negates the need to regear, at least from a gas mileage perspective. The Trail Recon channel did a mpg comparison after regearing his Gladiator and saw very little improvement.
4.56 or 4.88 gears would make that much better!
I put 37s on my FJ Cruiser and regeared to 4.83. I'm getting 10 mpg. If I was concerned about gas mileage, I wouldn't be driving an FJ. :)
Hold on- doing 75mph on stock tires = stock settings. When you put on the 35”s, then unless you recalibrated the odometer and such, then weren’t you actually going faster than 75mph?
Speedometer was recalibrated for 35”s with a Tazer mini.
@@ScrufsGarage I did hear that toward the end of the video but something’s not right. Your mileage should not be THAT bad. I would expect a 3-5 mpg drop given increased weight and wind resistance… that’s what I saw in my old lifted Wrangler, and it got much worse once so regeared. Lol
i have a 1997 jeep xj with 3.55 gears i have 33 12.5 x 17 ridgegraplers i get 11 in city about to regear to 4.56
Nice. I had a ‘96 XJ for many years. Loved that Jeep.
Did you regear by any chance after this video? and if so, hows the mileage then?
Currently I have not regeared. Daily driving has been acceptable. Another YT channel did a test after regearing and only saw a slight mpg improvement. Generally speaking I’m averaging 13-14 around town and 17 on the hwy.