2025 Gmc At4 2025 Diesel Mpg. View detailed specs, features and options for the 2025 gmc sierra 1500 4wd crew cab 147 at4 at u.s. That's driving through two snow storms in 4wd and a trip in to the.

My 2020 at4 3.0 diesel usually averaged about 5 to 6 mpg better than the 23 at4x 6.2. Research the 2025 gmc sierra 1500 diesel with our expert reviews and ratings.