GM tries to unplug Volt hype.

GM Vice Chairman Bob Lutz introduces the Chevrolet Volt concept at Detroit's North American International Auto Show. The Volt has attracted much attention since its unveiling in January. General Motors Corp. seized the world's attention in January when it unveiled plans to build the Chevy Volt -- a plug-in hybrid car touted not so much as a mode of transportation but as part of a solution to the nation's energy crisis.