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Don't say vapor, as pointed out it would be insignificant. Water injection has been around a long time. It was great in 1975 when gas went to crap and there were old hi performance 60s muscle cars running around calling for 15 degrees advanced timing and 12:1 compression on old school heads. Basically the water could reduce detonation. It wasn't for fuel economy it was just to put a bandaid on a problem. Turbos and superchargers can run extra boost with a water/alcohol injection system as well. That is to make lots more power, again no improvement in fuel economy.
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