I Try Again...Highway MPG Test with My 6.6L L8T Gas Engine in 2024 GMC Sierra 2500 HD

Now that my engine is broken in with over 1,700 miles, an oil change, and a tonneau cover, I try a highway MPG test again to see if those factors make a difference in MPG on the new 6.6L L8T gas engine with 10-speed Allison transmission. If you didn't catch my original MPG run, check out this video here:
• MPG Test // I Drive 40...
00:00 Intro
03:15 Why is MPG All Over the Place?
07:43 Updates
12:51 MPG Results
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