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Have heard nothing but good things about Water Wetter. Good product for track use. For economy? No.
Alcohol injection helps control detonation. It won't equal better economy on gasoline engines, not unless you tune the car to run much leaner and use the injection to keep the motor from blowing... I guess... but I don't know anyone who's tried that.
There are claims that it does improve economy for diesels, but I don't know if that's with retuning or not. Most likely with.
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