LOS ANGELES, CA - NOVEMBER 29: The Mercedes-Benz Ener-G-Force concept is unveiled during the Los Angeles Auto show on November 29, 2012 in Los Angeles, California. The LA Auto Show opens to the public on November 30 and runs through December 9. (Photo by Kevork Djansezian/Getty Images)
LOS ANGELES, CA - NOVEMBER 29: The Mercedes-Benz Ener-G-Force concept is unveiled during the Los Angeles Auto show on November 29, 2012 in Los Angeles, California. The LA Auto Show opens to the public on November 30 and runs through December 9. (Photo by Kevork Djansezian/Getty Images)
