[elhigh]

I think hydrogen offers a pretty poor return on an energy investment, if that's how you want to convey energy from a generator to your car. Ultracapacitors, for instance, do much better job of returning what was put into them than batteries. There's the niggling detail of poor capacity compared even to modest batteries, but hope springs eternal. And none of this addresses the very real hurdle of an almost complete absence of a hydrogen infrastructure. The grid, lossy as it is, already exists. The gasoline infrastructure already exists.

I remain unconvinced of hydrogen's utility as an additive to a gasoline burning engine. I haven't seen anything compelling that makes me think it's actually leaning out the engine, or displacing fossil fuel consumption, or any kind of bootstrap process that somehow makes the engine's output produce an overunit equivalent quantity of energy in the form of hydrogen. If I believed that, I would be investing also in self-torqueing flywheels and magnets.