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President Barack Obama greets workers at the General Motors Detroit-Hamtramck Assembly Plant Friday, July 30, 2010 in Hamtramck, Michigan. Chevrolet announced today, it will increase the U.S. production capacity of the 340-mile extended range electric Chevrolet Volt by 50 percent due to strong public interest. The Volt will be built at the Detroit-Hamtramck Plant. (Photo by John F. Martin for Chevrolet)