American automakers hold a media preview for their new electric concept cars in Washington

A prototype Chevy Volt is seen during a media preview to showcase advance electric vehicles currently in production by General Motors, Ford and Chrysler on Capitol Hill in Washington on December 4, 2008. The CEO's of the three automakers testified on the state of the American car industry on Capitol Hill today. The Volt in GM's first electric-gasoline mix powered vehicle, designed to be driven for 40 miles before the gasoline engine takes over. (UPI Photo/Kevin Dietsch)