GMC announced the 2009 GMC Sierra Hybrid, a powerful full-size truck that is 40 percent greater fuel economy in town and a 25 percent improvement in overall fuel economy while providing the capability expected of a full-size truck - including a 6100 pounds (2767 kg) towing capacity.The partnership of General Motors 'patented two mode' hybrid system and a gas efficient 6.0L V-8, the Sierra Hybrid
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