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NASA tested it, and injecting hydrogen into a piston engine does increase flame speed and increases efficiency slightly. Also, piston engines can burn hydrogen just like propane and CNG.
The problem is storing hydrogen to do it (and, buying hydrogen, since its not really in every store).
Borderline disclaimer for anyone seeing this: there is ABSOLUTELY NO WAY you're gonna generate enough hydrogen from water on board a car while driving, the amount of hydrogen needed is immense.
But basically, in all the same ways injecting propane works, hydrogen would work too.
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