Disagree tbh. There are efficiency issues that would need to be overcome. If you look at the car it's pretty light and the amount of water required to run it at a short distance at moderate speed is significant (this isn't what he says in the video but he's exaggerating because he's trying to get investors - he essentially called it a perpetual motion machine lol). He is converting water to hydrogen. In a way the hydrogen cars solve two issues: 1) space saving so you can store more fuel. 2) Allows big companies to get their beaks wet selling us fuel (that the govt can tax).