2025 Gmc Sierra Duramax Mpg. While the regular 4×4 sierra with the duramax diesel gets 24 mpg combined, the at4x is rated at 19 mpg combined. If your serious about a gas hd truck look at ford with the big block v8 in it, very impressive engine and its really good on gas, my buddy has one in a srw 350 and he’s claiming very good gas mileage.
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NEW, 2025 GMC Sierra 2500HD AT4, Duramax! YouTube, Current truck is a 2014 duramax with the 6 speed.
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2025 Gmc Sierra 2025 Duramax Specs Kacy Demetris, The at4x has larger tires, heavier wheels, and front/rear lockers.
2025 Gmc Sierra 3500hd, If your serious about a gas hd truck look at ford with the big block v8 in it, very impressive engine and its really good on gas, my buddy has one in a srw 350 and he’s claiming very good gas mileage.
