Iamon lyme: Your saying no private business is willing to entertain financing them? Yes, they are not free to build.. but that was not the point.

"If a car could run only on the hydrogen from it's own water supply, and channel the water by product back into that water supply"

I'm not sure that is possible yet as a street level device.

"for gathering hydrogen from water is about as effective as extracting a little bit of power from the cars own intertia and feeding that back into the electrical system."

No, the gasses fed to the engine are changed. Our atmosphere is mainly nitrogen and does not burn. HHO being two molecules of hydrogen and one of oxygen means the gasses are more reactive, hence more power for the same amount of fuel.

"without ever having to fill a hydrogen tank from time to time, then you would essentially have a perpetual motion machine."

No, the water would need topping up and the electrodes will only last so long.

"Wow, it's legit!"

.... Just say I believe you V ;P