Quote:
Originally Posted by Jonesy
Geez, I have a 2020 GMC HD2500 with 6.6 gas and I love it. It looks like Im getting sbout the same MPG (14 and 17-18 HWY) as the 2022 Duramax. It says my best mileage was 19.6 for 50 miles.
The 6.6 gas engine is totally an upgrade from the previous 6.0.
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I've heard good things about the new 6.6. My dad has been contemplating trading his 14 3/4 ton in (6.0) for a 21-22 with the gas 6.6. Still the same 6L80 from what I've read but I think the larger engine has an easier time pulling that truck around and also doesn't use as much rearend gear to do it. I think they come with 3.73's and dad's came with a 4.10