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Hydrogen works. But you have to prove that the power used by onboard generation is more than offset by the fuel saved.
And since you brought it up, you also have to prove it works better at preventing knock in lean conditions than simply injecting water... Which, IMHO, is a much simpler proposition.
And you have to prove it works better than simply retuning the motor.
If you are doing multiple changes to the powerplant, you have to separate the effects of each change for your data to be credible.
This is the same with power claims from aftermarket tuning parts. You have to show the breakdown of gains from each part in isolation, you can't claim an extra hundred horses from a performance chip if it just happens to come bundled with a turbo kit.
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