Hummer Hybrid...Then what?

Despite having several different hydrogen-burning motors and fuel systems in its arsenal, General Motors took the opportunity to develop a new, more practical hydrogen drivetrain for the H2H. As opposed to conventional fuel cell vehicles, like the Ballard-powered Mercedes A-Class that runs off of a chemical reaction between hydrogen and oxygen to provide power, the H2H burns its hydrogen much like a regular car burns gasoline or diesel. Much like the Ford H2 ICE (internal combustion engine) or BMW Clean-Fuel hydrogen-powered concepts, this hummer features hydrogen injected directly into its engines cylinder combustion chambers.
Unlike traditional fuel-cell technology, injecting liquid hydrogen into an internal combustion environment produces less than optimal power. Even with the assistance of a supercharger, the GM-designed Vortec 6000 6.0-liter V8 produces a meager 180 horsepower when run on hydrogen, only a fraction of the 316 horsepower produced by the SUVs regular gasoline-swilling powerplant. In any respect, the hydrogen-powered H2H has a hands-down advantage over the regular H2, with the only tailpipe emissions emitted being water vapor.