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Ya know, Dave--these guys aren't trying to sell anybody spark-plug fluid, their theory is that a little H2 acts as a catalyst, and they're using electricity that otherwise would have gone to charging a full battery. It's not "free energy," but energy that would otherwise be wasted. Can you get a 0.4 mpg increase by adjusting the alternator? I bet you can.
I still suspect the hydrogen has already recombined into water by the time the spark plug fires, and that it's already flashed to steam by the time the spark plug fires. A little bit of atomized water in through the intake could do everything they're seeing.
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