Mitsubishi Motors Corp President Osamu Masuko introduces the company's concept car i-MIEV sport during the press day of the 40th Tokyo Motor Show at Makuhari Messe, on October 24, 2007 in Chiba Prefecture, Japan. (Photo by Koichi Kamoshida/Getty Images)

Mazda Motor introduces the company's concept vehicle, Taiki during the press day of the 40th Tokyo Motor Show at Makuhari Messe, on October 24, 2007 in Chiba Prefecture, Japan. (Photo by Koichi Kamoshida/Getty Images)

Suzuki Motor introduces the company's concept vehicle, Kizashi 2 during the press day of the 40th Tokyo Motor Show at Makuhari Messe, on October 24, 2007 in Chiba Prefecture, Japan. (Photo by Koichi Kamoshida/Getty Images)

Daihatsu Motor introduces the company's concept vehicle, MUD MASTER-C during the press day of the 40th Tokyo Motor Show at Makuhari Messe, on October 24, 2007 in Chiba Prefecture, Japan. (Photo by Koichi Kamoshida/Getty Images)

American Honda vice president of corporate planning and logistics Dan Bonawitz (L) and Honda designer Jason Wilbur talk near the unveiled Honda FC Sport fuel cell concept car as the Los Angeles Auto Show opens for press previews at the Los Angeles Convention Center on November 18, 2008 in Los Angeles, California. (Photo by David McNew/Getty Images)

A model poses with the Daihatsu Motor Co.'s concept vehicle “Deca Deca” during the 41st Tokyo Motor Show at Makuhari Messe on October 21, 2009 in Chiba, Japan. (Photo by Kiyoshi Ota/Getty Images)

A model poses with the Daihatsu Motor Co.'s concept vehicle “e:S” during the 41st Tokyo Motor Show at Makuhari Messe on October 21, 2009 in Chiba, Japan. (Photo by Kiyoshi Ota/Getty Images)

Mitsubishi Motors Corp.'s concept electric vehicle “i-MiEV CARGO” is displayed during the 41st Tokyo Motor Show at Makuhari Messe on October 21, 2009 in Chiba, Japan. (Photo by Kiyoshi Ota/Getty Images)

Mazda Motor Corp.'s compact concept vehicle “Kiyora” is displayed during the 41st Tokyo Motor Show at Makuhari Messe on October 21, 2009 in Chiba, Japan. (Photo by Kiyoshi Ota/Getty Images)

A Green Vehicles' Triac is displayed at the North American International Auto Show January 11, 2010 in Detroit, Michigan. The Triac is a 100% electric vehicle, has a top speed of 80 miles per hour, and a 100-mile range. (Photo by Bill Pugliano/Getty Images)

A “Tango” all-electric vehicle from Commuter Cars Corporation is displayed at the North American International Auto Show January 11, 2010 in Detroit, Michigan. The Tango has a length of 8'5", a width of 39", a height of 60", and can go from zero-to-sixty mph in about 4 seconds. (Photo by Bill Pugliano/Getty Images)