File photo of a Chevy Volt in Detroit

 
File photo of a Chevy Volt in Detroit
A Chevy Volt hybrid driven by General Motors Vice Chairman Tom Stephens pulls into the front of GM's world headquarters in Detroit, Michigan in this October 12, 2010 file photo. GM said on Wednesday its Chevy Volt plug-in hybrid will carry an overall fuel economy rating of 60 miles per gallon, topping the Toyota Prius, the industry's long-time fuel economy leader. The EPA fuel-economy rating, which will be displayed on stickers on each Volt sold, was one of the last hurdles for a vehicle that GM has made the center of its effort to restart its reputation for technology and innovation. REUTERS/Rebecca Cook/Files (UNITED STATES - Tags: TRANSPORT BUSINESS)