2015 Chevrolet Silverado HD / 2015 GMC Sierra HD: Heavy Duty Evolution

Photo: Benjamin Hunting.
At close to $10,000, there's no denying that the 6.6-liter Duramax turbodiesel V8 engine significantly boosts the window sticker of either truck.

Photo: Benjamin Hunting.
At close to $10,000, there's no denying that the 6.6-liter Duramax turbodiesel V8 engine significantly boosts the window sticker of either truck.

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