Family Vacation: I Test If The 2021 GMC Sierra Diesel REALLY Gets 24 MPG On A 400-Mile Road Trip!

The 2021 GMC Sierra AT4 with the 3.0-liter Duramax diesel engine should be one of the most efficient off-road trucks around, but how well does it cope on a frigid 400-mile family road trip in the Colorado Rockies? Andre puts GM's fuel economy claims to the test on a skiing vacation.

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Видео Family Vacation: I Test If The 2021 GMC Sierra Diesel REALLY Gets 24 MPG On A 400-Mile Road Trip! канала TFLnow