2026 GMC Sierra: Sierra 4WD AT4X · 6.2L · 4WD · 10-speed automatic
One configuration of the 2026 GMC Sierra as listed by our sources.
Configuration specifications| Engine | 6.2L 8-cylinder (SIDI) |
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| Displacement | 6.2 L |
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| Cylinders | 8 |
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| Fuel type | Gasoline |
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| Transmission | 10-speed automatic |
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| Drivetrain | 4WD |
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| Combined economy | 15 mpg (15.7 L/100 km) |
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| City economy | 14 mpg (16.8 L/100 km) |
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| Highway economy | 16 mpg (14.7 L/100 km) |
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