2024 Duramax Fuel Mileage 2024. Does anyone have any real world data on the 2024 6.6 gas v/s 6.6 diesel fuel economy. This is the first time i got a def message on the 2024, but i.
Looking at a new 2024 at4 and just curious if the 10 speed transmission helps with mpg. I got this message on my way to work this morning, it popped up with 500 miles def range.