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Originally Posted by cRiPpLe_rOoStEr
Did you notice any actual fuel-efficiency improvement with HHO? BTW many so-called HHO kits in fact only pour steam to the intake. Probably water injection would make more sense.
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Properly fitted, water injection saves fuel on diesels. But I don't think you can guarantee fuel savings on ALL diesels without at least some ECU tweaking.
On gasoline, it might help on turbo cars, but from what I've seen, the effects on economy gasoline engines is minimal... usually a nominal power bump, if any, and at a level that doesn't justify the price of installation.