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5.3 liter Flex-fuel V8

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2007 GMC Sierra engine compartment

Coupled with GM's Active Fuel Management System (cylinder deactivation), the 2007 Sierra's 5.3-liter flex-fuel (E85) engine delivers 315 horsepower and 338 lb-ft of torque along with decent 16/20 fuel mileage.

photo © Scott Gable
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