FILE - In this Wednesday, Aug. 5, 2009 file photo, Vice President Joe BidenAP – FILE - In this Wednesday, Aug. 5, 2009 file photo, Vice President Joe Biden looks over a Volt concept …
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WARREN, Mich. – General Motors Corp. said Tuesday its Chevrolet Volt rechargeable electric car should get 230 miles per gallon of gasoline in city driving, more than four times the mileage of the current champion, the Toyota Prius.