[Realism]

But is does take energy to create the hydrogen, and to run the alternator off of the hydrogen,

Im not arguing the fact that this device works. Im arguing the fact that if you enhance the horsepower of the engine beyond what is lost to turn the alternator you require less fuel to do the work.

[thackney]

Im arguing the fact that if you enhance the horsepower of the engine beyond what is lost to turn the alternator

You can never get more power out of the alternator than what you put in. If you draw more power out of the alternator with increased electrical load, it requires even greater power delivered from the engine via the shafts, belts and pulleys. Frictional losses through all these devices create additional loss. If the speed is constant, the additional power is supplied by additional torque.