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You can't beat the laws of thermodynamics.  Simply cannot be done.  Generation of hydrogen by electrolysis consumes more energy than it produces-PERIOD!

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A car makes more electricity then it needs. That is wasted energy. If you could recycle that surplus into fuel the argument that it would be ineficient loses its value. After all it would be free energy.. Or am i missing something.

Not to start a flame war or something, but just wondering if that would make a difference at all.