... and the really funny part is that's the more efficient process of the two. Using an alternator to split water into H2 and O2 loses you about 25% energy because of the losses in the alternator efficiency alone. Then to extract the power back out of the hydrogen they're burning it in a 4 stroke engine, which is only about 30% efficient.
Wanna keep going? We're using gasoline in a 30% efficient reaction (combustion) to drive the alternator in the first place... more losses. Then , hydrogen has only about 10% of the heat content of gasoline, so we'd need 10X the amount of hydrogen to power the vehicle the same way.
I don't know how he can keep a straight face!
Joe