The 2020 GMC Sierra 1500 AT4 3.0L Duramax qualified for this year’s test with the combination of the AT4 off-road package and the new 3.0L Duramax diesel engine. See how the Sierra half-ton survived our flogging in the 2020 Pickup Truck of the Year test. What’s Hot 0L Duramax diesel + 10-speed automatic Definitely won
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