Ugh. Move along here people, nothing to see.
Why you ask?
Because no process can ever be 100% efficient, it will take more energy to break apart the H2O molecule (using electricity) than you get out of burning it.
Thus your car will have to have not only 0 friction in any moving parts/ground/air/etc, but have negative resistance (riding with the wind, downhill, on ice) just to break even on the process.
Maybe if they blend with a process of plugging a car in overnight to recharge batteries, but dont mistake this process as practical anytime soon.
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