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The 2027 GMC Sierra's V8 Is More Powerful, But Less Efficient

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The 2027 GMC Sierra's V8 Is More Powerful, But Less Efficient

GM's own 2027 fuel economy table for the Sierra 1500's redesigned engine lineup finally shows how the new V8s stack up. The numbers settle a trade-off truck buyers have been asking about since the engines were announced: the returning 3.0-liter Duramax diesel still beats the gas V8s at the same trim levels.

The two-wheel-drive 5.7-liter V8 posts 15 mpg city, 19 mpg highway, and 17 mpg combined, while the diesel in comparable 2WD trims carries a 25 mpg combined rating. That gap changes the running costs for anyone cross-shopping GMC's new Gen 6 Small Block V8 engines against the carryover six-cylinder diesel.

According to GM Authority, citing GM's 2027 fuel economy table, the 5.7-liter L76 V8 in two-wheel-drive Pro and Elevation trims carries a 15/19/17 mpg city/highway/combined rating. In four-wheel-drive Pro, Elevation, AT4, and Denali trims with the 5.7-liter V8, the figure is 16 mpg city, 20 highway, and 18 combined. Equivalent 6.6-liter V8 trucks post lower economy.

Denali and Denali Ultimate trucks with the 6.6-liter V8 return 14 mpg city, 18 highway, and 15 combined. The off-road AT4X with the 6.6-liter is rated at 13 mpg city, 17 highway, and 15 combined, with a separate mud-terrain tire configuration listed at 13 mpg city, 16 highway, and 14 combined.

The Duramax tells a different story at the same trim levels. Two-wheel-drive diesel trucks in Pro, Elevation, and Denali trims hit 23 mpg city, 28 highway, and 25 combined. Four-wheel-drive Duramax models in Pro, Elevation, AT4, and Denali trims manage 22 mpg city, 26 highway, and 24 combined.


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