Hydrogen on earth is not a fuel. It is only an energy carrier.
There is more hydrogen in gasoline than there is in liquid hydrogen.
Electrolysis is not usually your best way to generate hydrogen.
The available energy in a hydrogen flame is very low.
Hydrogen can rot metal through an embrittlement and will easily diffuse through most other materials.
A closed-loop electrolysizer stops a car in less than its coasting distance.
Pulsing, ac, or sparking will only reduce electrolysis efficiency.
Water is not a fuel. It is an ash.
Another name for an on-board closed loop auto hydrogen generator is a dynamic brake. One that, if activiated, causes your car to stop in much less than its normal coasting distance.
There are always heat losses in all alternators, electrolysizers, and heat engines. All closing your engine to alternator to electrolysizer loop does is cascade these loses.
Why don't you go back to when people were wiping their ass with leaves!!!
Let people with vision chase an idea. You are probly well educated. When did lose your quest for knowlege? Please turn your negativity into creativity.