The GMC Sierra Hybrid became available in early 2009, in two-wheel-drive & four-wheel-drive crew cab short box models. The two-mode hybrid system includes a 322-horsepower 6.0-liter V8 and two 60-kilowatt electronic motors in an electronically variable 4-speed automatic transmission. The Sierra Hybrid can be powered by the electric motors at speeds of up to 30 miles per hour and will deliver fuel economy of up to 21 miles per gallon in the city and 22 miles per gallon on the highway with the two-wheel-drive version or 20 miles per gallon with the four wheel drive version, but still have a 6,100-pound trailer rating when needed.
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