It's much worse than that - auto alternators are more like 60% efficient, and they don't like constant loads, the hotter it gets the worse the efficiency is.Lets say your car engine is 25% efficient, your alternator is 95% efficient, and your electrolysis process is 50% efficient. Multiply the efficiencies and you get 12%.
You are in fact dead wrong. Until somebody comes up with a better way to produce hydrogen, it actually takes an enourmous amount of power to "release the awesome power of hydrogen from water".Dead wrong..........That's the whole point of HHO testing . It requires very little energy to release the awesome power of Hydrogen from water .