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2020 GMC Sierra 3500 Denali Duramax Diesel MPG Test, Review
Heavy-duty trucks like the 2020 GMC Sierra 3500 have always benefitted from diesel engines, for better duramax diesel mpg, however, those engines aren't always the most fuel efficient when not towing and compared to the pre-def or deleted diesel trucks. In this review, we take the Sierra 3500 and its Duramax diesel on a road trip to see what ...
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