Hummer headquarters lately since consumers have been going ga-ga over fuel efficient vehicles. Something along those lines may explain a concept vehicle introduced by the company at this year's Detroit Auto Show: a smaller, lighter, and E85-capable new SUV dubbed the Hummer HX. GM CEO Rick Wagoner lauded the domestically-produced ethanol-based fuel used in the new design, which rings a number of Halo bells, not unlike the Jeep Renegade concept we've seen recently. The sport-utility rocks a slew of unique features, including an armored underbelly, customizable LED displays, removable fender flares and roof, and lack of a radio or CD player (it's only got an iPod dock). Of course, the car is just for show right now -- but maybe it's a sign that the age of fuel-guzzling Hummers is coming to a close... nah, probably not.