2024 Chevy Duramax High Country Mpg. Looking at a new 2024 at4 and just curious if the 10 speed transmission helps with mpg. That engine has 470 horsepower and 975.

Official epa estimates predict the zr2 will average 20 mpg in town and 22 mpg on the highway, for a combined rating of 21 mpg. The 2024 silverado 2500 duramax diesel achieved a result of 18 mpg in our testing.