actually, ford produced a slew of flex-fuel vehicles in the 90's. some of which run on CNG, which would be quite capable of running on hydrogen. there is a guy in town who took one of those CNG motors and put it in his round-nose thunderbird. its got a procharger on it too or something. nice guy, a little weird though. i think the motor actually came from a service truck from a fuel supplier, liek the guys who come and refill your Propane or Natural Gas tanks that heat your homes. the trucks run off the gas since its cheaper and easier for them than gasoline.