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The better question would be to ask is:
What is the cheapest most efficient feed stock to make hydrogen from?
That would be natural gas. Take the natural gas and let it break down into hydrogen in side the combustion chamber of your engine. Problem solved, range extended.
"Even then you'll be faced with hydrogen's lousy volume / power ratio".
Don't for get the high cost of hydrogen.
"I realized that you can't take water, convert it to hydrogen and oxygen, burn it, move the vehicle, and have enough power left over to generate more hydrogen".
Its called the first and second laws of thermodynamics and some guys over in europe figured it out around the 1860s.
The first law (and how it obeys the conservation of energy) shows why you cant have Perpetual motion machines and the second law (Carnot thermodynamic theorem) details the efficiency of heat engines.
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