2020 GMC Sierra 1500 AT4 Diesel First Drive: Off-Road Rich

The rumors of the diesel engine’s demise are greatly exaggerated. Case in point: the half-ton truck market, where every America brand now offers the option of a diesel engine in its respective entrant. One of the latest additions to this segment is the 2020 GMC Sierra 1500, which shares its available turbodiesel 3.0-liter inline-six with its Chevrolet Silverado 1500 cousin.

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