Quieter and More Powerful, New Sierra’s Many Improvements Give It an Impressive Competitive Edge and Added Driving and Towing Versatility On the outskirts of a small town along the Utah/Colorado border, I prepare to pass slower traffic in a 2017 GMC Sierra 2500 Denali with the new 6.6L Duramax turbo-diesel V8. My aim is simply to see how [...] More »

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