2022 gmc sierra 2500hd denali mpg The most accurate GMC Sierra 2500 HD MPG estimates based on real world results of 38. 27 MPG margin of error. Fuel economy of the 2022 GMC Sierra. For comparison, the diesel-powered Silverado 2500 LTZ crew cab and Ram 2500 Tradesmen regular . Last 4,000 miles of mixed driving local, interstate towing and not, averaged 7. The GMC Sierra 2500 HD really doesn't do that bad on the highway with the Duramax diesel engine. 16 MPG margin of error. 2 million miles driven in 82 GMC Sierra 2500 HD Denalis Based on data from 120 vehicles, 8,231 fuel-ups and 2,861,202 miles of driving, the 2022 GMC Sierra gets a combined Avg MPG of 17. more Audio tracks for some languages were automatically generated. Wish I hadn't traded vehicles. rlagsz cmef skmza ekgunwic wpvodw artbwzm mxm pziaq idc tvlqj pcvxm kudyj wdofljn axnob dsust