Natural-gas vehicles hot in Utah, where the fuel is cheap

Lee Mercer watches another vehicle pull up as he fills his truck's tanks at a compressed natural gas station Thursday, April 24, 2008, in Murray, Utah. Mercer said an added benefit is his special CNG license plates that allow him to park in downtown Salt Lake City for free at parking meters and use the HOV lanes on the freeways when he is the only person in the truck. (AP Photo/Douglas C. Pizac)