General Motors Chief Executive Fritz Henderson announces the Chevrolet Volt, a rechargeable electric car, during a news conference at GM's Warren Technical Center in Warren, Michigan August 11, 2009. The Chevrolet Volt -- the electric vehicle General Motors Co is counting on to recharge its image with consumers -- is on track to hit an unprecedented fuel economy rating of 230 miles per gallon in city driving, the automaker said on Tuesday. REUTERS/Rebecca Cook (UNITED STATES BUSINESS TRANSPORT)