Road Test: 2021 GMC Sierra 1500 Duramax 4WD Crew Cab AT4 CarbonPro
Clean Fleet Report
MARCH 30, 2021
These numbers are a bit lower than competitor trucks, but the trade-off is better fuel economy in exchange for less payload and towing. Fuel economy for the 3.0-liter In 235 miles we averaged 25.2 mpg, but on a 100-mile all-freeway run with the adaptive cruise control set at 65 mph, we got an impressive 29.8 V8 and 6.2L
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