2024 Gmc Hd Duramax Fuel Mileage. I've heard terrible fuel mileage aswell. Since my 2021 duramax got a new ecm flash from the dealer, it’s getting even better fuel mileage mid 20mpg canadian driven at the speed limit.

“these new pumps have a pumping capacity of. I was at my dealer for service to my 2022 zr2 this morning and they had a white 2024 2500 hd zr2 on the floor optioned out on the sticker at $87,905.