The cheap devices purporting to separate hydrogen from the water are banking on a "synergistic" effect of blending the two fuels (i.e., hydrogen gas and gasoline). Does it exist?
There is some effect that has been shown in labs that combining hydrogen and diesel improves combustion. But in those systems, half the diesel is displaced by the hydrogen gas. I don't think the little under-the-hood hydrogen generators are producing that much hydrogen.
I think this is snake oil, but its fine to experiment. Just be prepared to have the conventional wisdom win on this one.
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