2024 Gmc 3500hd Duramax Mpg. Looking at a new 2024 at4 and just curious if the 10 speed transmission helps with mpg. The most accurate gmc sierra 3500 hd mpg estimates based on real world results of 9.6 million miles driven in 397 gmc sierra 3500 hds.

Among the 2500 hd and the 3500 hd models, the powertrain. How does the size affect performance?