I remember reading an interesting story about a man who invented a much more efficient way of splitting H/O, could be retrofitted to existing cars to make them run on hydrogen instead of petrol. First he got bullied by big oil companies, then he was mysteriously murdered. It does make you wonder whats really going on.
I think I have the right guy in the link below:
http://en.wikipedia.org/wiki/Stanley_Meyer's_water_fuel_cell