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6.2 all day ! just passed 3k on my 24 T Grey as well. don't buy a full size truck and worry about MPG :)

If you wanted a fast sierra, you get the 6.2. You get the 3.0 for towing and fuel efficiency

You should get the beard growing

I'm 320 and 6 ft and considering either the 400, 500, or 650. For a long term bike, also my first. Dont wanna have to keep buying or selling to upgrade.

Do you run premium fuel every fill up?

Are you running premium fuel every fuel up?

Nice truck !

Same truck I have it's freaking awesome

Im picking up my thunderstorm grey at4 tonorrow. Im pumped.

Congratulations on your AT4. Got mine 3mos ago!

Truck looks beautiful in that color. Looking at trading in my 2022 Denali for this exact truck.

How funny that happened to a co worker he was driving around the construction site not knowing his tail gate was down the whole time luckily his tools didn’t fall out 🤦🏻‍♂️

just commented on another vid but just saw this is ur recent video up for the 3.0L duramax, and i noticed u have the transmission fluid temperature on ur cluster and wanted to know how high does the temperature go for you if ur driving long distances or even in the city?

when driving long distances, does the transmission fluid temperature stay around the 196°F-200°F area? asking because i have a duramax 3.0L and wanted to see if ur getting those temps as well

Where you get that ramp from ?

I have a 24 Silverado and I agree they are pretty close to ugly.

Even with payload my 3lt duramax is 28mpg no way a gas model can beat that….

my 5.3 was around 15-16 city and freeway.....on the interstate only like 22 the diesel for sure will be better

I have a sierra 2023 slt with the x-,off road package 4x4 5.3 I get 26 mpg on the highway 🛣️ Dallas highway .

26,000 miles for first oil change? What is recommended for the 6.2?

I have zero experience with both of these engines. What I do have experience in is calculating "actual" cost of driving different vehicles. You MUST calculate total cost of a vehicle which includes many things most don't think about. Compare vehicle msrp, resale values, Insurance costs, maintenance costs, DEF if diesel vs not, diesel vs gas prices and a few more things but you get the picture. Back in '07 when I bought my Dodge Ram diesel I calculated I could pay .50 per gallon more than gasoline in my Silverado and break even with fuel costs. That's just one example I calculated. It's not just about MPG. Bottom line is, what is your total cost per mile to drive xxx vs xx? It's all simple math.

I averaged 35mpg with the LZ0 yesterday going through Yellowstone Park, only averaged 23 with the 5.3 liter, averaged about 22 in the 6.6 duramax. Oddly there are times when they are similar though (esp during regen) Currently own all 3.

I went to Florida in February with my 2023 AT4 3.0. Put on 3500+ miles. On average I got 32-36.5 mph. Mostly hwy but also driving 75-85 mph . Not complaining at all.

Nice colour 👍✌️🇨🇦

That was pretty fast after 60 it drops off though

You don’t buy that engine for the sound.

Yea it all depends on how fast I drive, if I go between 55-65 I can get crazy mpg like 33 my best was 40.3 on my 24 3.0 2WD 18” rims but if I drive over 70-80 it’s like 23-24 I had a 2018 5.3 v8 and got great gas mileage around 23 I also briefly had the 2.8 it was around 19 mpg but I was always gassing it definitely depends on how and where you drive

You’re still saving money with the 3.0 since diesel is cheaper than premium.

36 gallons tank ? If it is total range after filling them up should be around 650 miles.

I’m in Service at a GMC dealership and I promise you the 6.2 is not getting that fuel economy. Every one that comes in is getting 17-18

Glad I got a 24 more power ! But yours didn’t seem that bad !

Glad you haven’t gotten any problems, and free maintenance is sweeeeet

Should have knows the second he said dirty max.

Great video, Do you use the Auto Start/Stop feature to achieve that fuel economy? I’m curious does Sport Mode permanently disable Auto Start/Stop? I know a lot of people dislike turning it off every time they enter the vehicle.

2020 LM2 3.0 Duramax gets me 29-31 mpg on highway. 24 mpg city

Have to put 93 in it right?

Just bought the 2024 Denali 6.2L with super cruise. Paid $75K for it and I Love it. Just crossed 1000 miles in it yesterday. Dope truck bro. That color is so nice

I never get less than 28mpg on the highway with my 2024 LZO crew cab high country crew cab 4x4 with max tow.

The real way to track a vehicle is cost per mile not MPG.

little worse mileage ... but WAAAAY better sound and powerband. the 3.0 is a great engine and reliable, nothing wrong with it. but the 6.2 is for me all day

Something is wrong as your results, high 6.7L and low 3.0L results, don't appear repeatable by others. It would be all over CZcams if was commonplace narrow spread difference yet there are none, nor individuals reporting similar in comments - none thus far on 6.7L and 3.0L typically exceeding yours. For a larger sample, just checked Fuelly which reflects actual usage and calculated on mileage and gallons at fill-up. There is a HUGE spread, in fact the average 16mpg for the 6.7L was the low end 15-16mpg for the 3.0L which I presume would be towing and RV. The 6.7L average 16mpg on 52 fill-ups with a high of 21mpg on 3 fill-ups and low of 12mpg on 2 fill-ups. Of the 12 vehicles in the sample, the high average with 4 trucks was 16mpg. Further the 5.3L bested the 6.7L by 1 to 2mpg but wont go into specifics. Now the 2024 (I know yours was a 22 which had similar results) the high average ranged between 22 and 24mpg on 358 fill-ups - which far exceeds the 6.7L's 16mpg. On outliers, 31mpg on 2 fill-ups and 15mpg on 8 fill-ups which I presume was towing mileage. Of the 63 trucks in the sample, 12 trucks returned the high average at 24mpg.

is there a notable difference between the 6.2 and the 5.3 ?

The gawd awful sound quality lost me in the first minute! Like What the actual Fuk?!

Biden and friends are choking diesels. If you delete the 3.0 it'll get double the economy

Which truck is faster?

What about the trip with the cobalt engine Silverado

I don't trust the 3.0. I'm working on one right now with a broken timing chain, it destroyed all the lifters and valves when it broke. About 2 weeks ago I had one in my shop that had a loud knock, I had to put a new oil pump in it. Only 32k miles.

For MPG, Dmax is untouched

My avg mpg in my 3.0 on a 580 trip is 29. Mixed hwy through Dallas. Been as high as 37 in Dallas

I have had my 2020 sierra 3.0 duramax since 2020 and continue to get an average of 9L per 100Km for my canadian friends. Buddys with the 5.3's get 12-13L per 100 on average.