2024 6.6 Duramax Fuel Mileage. Does anyone have any real world data on the 2024 6.6 gas v/s 6.6 diesel fuel economy. Going next week to order my truck, and i'm seriously torn on which to get.

View detailed gas mileage data for the 2024 gmc sierra 2500hd. Looking at a new 2024 at4 and just curious if the 10 speed transmission helps with mpg.