In this file photograph taken Dec. 2, 2009, the 2011 Chevrolet Volt debuts at the Los Angeles Auto Show, in Los Angeles.  (AP)
In this file photograph taken Dec. 2, 2009, the 2011 Chevrolet Volt debuts at the Los Angeles Auto Show, in Los Angeles. (AP) AP
In this file photograph taken Dec. 2, 2009, the 2011 Chevrolet Volt debuts at the Los Angeles Auto Show, in Los Angeles. (AP) AP