Road Test: 2021 GMC Sierra 1500 Duramax 4WD Crew Cab AT4 CarbonPro
Clean Fleet Report
MARCH 30, 2021
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 gasoline engines, offering a smooth power plant that can flirt with 30 miles to the gallon on the highway. & the baby brother midsize diesel—the 2018 Chevrolet Colorado Duramax.
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