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|2021||2021 4dr Crew Cab 6ft bed turbocharged 277hp 3.0L V6 Diesel 10-sp shiftable automatic 4WD w/low range||24.5||
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|With the turbocharged 277hp 3.0L V6 Diesel engine, 10-speed shiftable automatic transmission, and four-wheel drive w/low range, the 2021 GMC Sierra 1500 has been averaging 24.5 MPG (miles per gallon).
The 2021 GMC Sierra 1500s in this analysis were driven mostly on the highway at an average speed of 70 miles per hour (about 50 percent of the miles driven). The rest of the miles were in the city (25 percent), in the suburbs (0 percent), and in heavy traffic (0 percent).
In addition, the average 2021 GMC Sierra 1500 in this analysis was driven on flat terrain with a light foot and the AC on only some of the time.