Road Test: 2021 GMC Sierra 1500 Duramax 4WD Crew Cab AT4 CarbonPro
Clean Fleet Report
MARCH 30, 2021
liter Duramax turbodiesel is EPA rated at 22 mpg city/26 highway/24 combined. mpg, but on a 100-mile all-freeway run with the adaptive cruise control set at 65 mph, we got an impressive 29.8 But nudging 30 mpg is impressive, which was aided by the engine stop/start system, which shuts off the engine rather than idling.
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