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2011 Sierra Hybrid - Great
Joey | 8/20/2013
This is a 1500 series truck that comes with a 6.0 and an electric motor built into the transmission. It is smooth and powerful. It is very quiet and well balanced. I find that I can drive through the neighborhood in pure electric mode. When I am driving 50mph or less at a constant speed, it is in v4 / electric mode. I have noticed great gas milage ...