2011 GMC Sierra Hybrid The 2011 GMC Sierra Hybrid and the very closely related Chevrolet Silverado Hybrid remain the only hybrid pickups for sale in the U.S. And going by the EPA numbers, they're the most fuel-efficient full-sizers avaiilable: with EPA ratings of up to 21 mpg city, 22 highway with rear-wheel drive, they have the highest combined gas mileage of any large...


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