[Christ]

Well, you have to electrolyze water to get the hydrogen, then you have to separate nitrogen from the air. Then you have to combine the nitrogen with the hydrogen to make anhydrous ammonia, which, due to meth-heads, you can't purchase legally in any quantity that would begin to fill a car's fuel tank without a license to do so.

All of those steps and energy expended just to get hydrogen, which on it's own can be used as a stable fuel, and is safer than the currently used alternatives, such as batteries, which can explode, gasoline, which expands and vaporizes under heat, causing an eventual explosion, or at least a hell of a fire, and similar other fuels.

Hydrogen as a compressed fuel, if the containment vessel were to burst, would rise to the atmosphere, instantly cooling the area immediately around the burst, in some cases, preventing it from catching fire at all.