Honda's new fuel cell vehicle "FCX Clarity" is presented to the media in Tokyo Tuesday, May 13, 2008. The hydrogen-powered vehicle, set for leasing later this year, radically reduced the sizes of its fuel cell stack and motor for a superclean car that's almost no different from a regular car, engineers said Tuesday. Honda's new hydrogen-powered vehicle, set for leasing within a few months, radically reduced the sizes of its fuel cell and motor. leaving the same interior space as a regular car, engineers said Tuesday.