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No, there was a thread about a month ago where someone was talking about a device that can be hooked up to the engine of a car and it would help with the mileage. I can't remember which thread it was. I think it was in the technical threads somewhere.
Keep your tires inflated properly, keep it tuned up, easy up on the pedals (both gas and brakes), and leave plenty of time to get where you've got to go so you don't stress out and "drive mad".
Anything else is a hoax device... but if you really believe in them, I've go ocean front property in Arkansas to sell you!
Theory is the alternator powers the electrolysis to split the water into hydrogen and oxygen which is then injected into the fuel system to increase the efficiency of the gasoline combustion.
Just so you know....several people have caused larger than normal explosions and actually destroyed their vehicles.
Most of these add on devices are from the days of carburetors -- very few (if any) worked, and with modern computerized fuel injection, engines already produce optimum MPG.
What M Leggett said about driving habits -- accelerate and brake slowly, lose the leadfoot, keep the tires inflated -- those are the best ways to improve MPG. I've heard that reducing speed and acceleration can improve MPG by 30%.
I don't know about the Sunoco racing fuel -- but contrary to popular opinion, higher octane gasoline burns more slowly than lower octane. Slower burning high octane allows the spark to be advanced more, which ensures a full burn and maximum power when the piston reaches top dead center. But modern engines run best on whatever octane is recommended (although my Subaru is designed for high test, the computer compensates when regular is used).