2025 Duramax Fuel Mileage. I was at my dealer for service to my 2022 zr2 this morning and they had a white 2025 2500 hd zr2 on the floor optioned out on the sticker at $87,905. Looking at a new 2025 at4 and just curious if the 10 speed transmission helps with mpg.
Use our handy tool to get estimated annual fuel costs based on your driving habits. I have 12,000 mile on a 2022 3500 gmc duramax, 10 speed 3:42 dually rear end 4×4, terrible mileage.