EPA ratings show every V8-powered 2027 GMC Sierra 1500 trails the Duramax diesel in combined mpg across two-wheel and four-wheel-drive trims.
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The 2027 GMC Sierra's V8 Is More Powerful, But Less Efficient
EPA ratings show every V8-powered 2027 GMC Sierra 1500 trails the Duramax diesel in combined mpg across two-wheel and four-wheel-drive trims.
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