2024 At4 2024 Duramax Mpg. That said, a decent size fuel. With a 19 mpg city, 20 mpg highway, and 19 mpg combined epa fuel economy rating, meanwhile, the diesel isn't quite as efficient as it is in other sierra forms.

Overlanding in this truck while getting more than 20 mpg nets you nearly. With a 19 mpg city, 20 mpg highway, and 19 mpg combined epa fuel economy rating, meanwhile, the diesel isn’t quite as efficient as it is in other sierra forms.