WASHINGTON - JULY 19:  An interior view of a Chevrolet Volt vehicle is seen during a viewing on Capitol Hill July 19, 2007 in Washington, DC. The Volt is a plug-in electric vehicle which will run its first 40 miles without using any gasoline, and then the battery pack will be re-charged by a small internal combustion engine that runs on gas, diesel or ethanol when required. The vehicle is expected to be on the market by 2010. Getty Images logo Getty Images 29 months ago

WASHINGTON - JULY 19: An interior view of a Chevrolet Volt vehicle is seen during a viewing on Capitol Hill July 19, 2007 in Washington, DC. The Volt is a plug-in electric vehicle which will run its first 40 miles without using any gasoline, and then the battery pack will be re-charged by a small internal combustion engine that runs on gas, diesel or ethanol when required. The vehicle is expected to be on the market by 2010.