There is some actual research going on with this, at least with diesel engines. Fast Company did an article a few years back on a mechanic/inventor in Kansas who uses hydrogen injection in diesel engines to increase fuel economy (his Lincoln Continental is said to get 100 MPG, although half the fuel burned is the hydrogen, and I don't think that's in the equation). The full story is at
Fast Company.
Quote:
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While researching alternative fuels, he learned about the work of Uli Kruger, a German who has spent decades in Australia exploring techniques for blending fuels that normally don't mix. One of Kruger's systems induces hydrogen into the air intake of a diesel engine, producing a cascade of emissions-reducing and mileage-boosting effects. The hydrogen, ignited by the diesel combustion, burns extremely clean, producing only water as a by-product. It also displaces up to 50% of the diesel needed to fuel the car, effectively doubling the diesel's mileage and cutting emissions by at least half. Better yet, the water produced from the hydrogen combustion cools down the engine, so the diesel combustion generates fewer particulates--and thus fewer nitrogen-oxide emissions.
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Appears at
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They use hydrogen from a gas bottle for it, though. This is also the guy creating a hybrid for Neil Young ... and there has been some criticism about hype from that project.
You have to remain skeptical about these things, though.