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There are dynos and testing data available online that show gains with water injection... with the proper tuning, of course, to take advantage of it.
No gains that I know of with gasoline (a friend tried running it) except in terms of power production on turbocharged cars (with non-turbos, a measly 3-5% power gain... a friend tried it), though it might be possible to run a lot leaner with it on any engine.
Have heard good things about diesel-propane, but distilled water costs a whole lot less...
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