If your fuel contains more energy then the motor has to output more energy just to keep the same efficiency.

Sure you can probably redesign a petrol engine to be more efficient on hydrogen fuel, but it's still much less than 100%. And you need _more_ than 100% efficiency somewhere in the system.

I'm sure you don't believe what you're saying because if you did, you'd be foolish not to give up everything you own to invest in this. Which isn't really hard, just maybe $1000 for the bits, and bingo! Remember this isn't just another gadget, this would turn all of physics and economics on its head. It would revolutionize the world overnight.