2027 GMC Sierra Ratings Show New V8 Engines Trailing Duramax Diesel in Fuel Economy
Official fuel economy ratings for the 2027 GMC Sierra 1500 reveal that General Motors’ redesigned V8 engines trade efficiency for added power, leaving the returning 3.0-liter Duramax turbo-diesel as the pickup lineup’s clear mileage leader. According to fuel economy documentation obtained by GM Authority, the new Gen 6 Small Block V8s yield lower combined mileage
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