Water4gas

OK, I'm trying to get my pea-brain around this. I imagine that hydrogen oxide gas would work like something akin to, but not exactly like, nitrous oxide. Nitrous is an oxidizing agent, if I am correct, but hydrogen is actually a fuel, but the "oxide" might also be an added oxydizine agent benefit.

Now, I know that hydrogen has specific energy content per given volume (I would have to research the BTU content on the internet), just like natural gas, butane, propane, etc., so burning it will produce power. In that case, when driving at a specific rate of speed, you would require less throttle (gasoline) with hydrogen fuel added to the burn, which would give you better gas mileage.

OK, I guess the theory is possible. My main question is how is the gas production regulated? How much is available for WOT conditions? Is gas production constant or can it be increased/decreased, based on load or RPM?

So many questions, so few grey cells.