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37 ml of acetone and 37 ml of water per gallon of gasoline... the acetone gives a small bump in octane rating, but it's really there to act as the go-between to bind the water to the gasoline. Acetone is completely miscible in water, and completely miscible in gasoline, so it acts to make the water miscible in gasoline.
The water has a high latent heat of vaporization, will damp combustion temperature peaks, will slow the flame front (only slightly at these low concentrations), and will add to cylinder pressure. That should knock down any spark knock you've got. And it'll clean out your fuel system, and steam clean your piston of any carbon deposits.
The only thing you have to watch for is if your gasoline has ethanol in it, it may already have some water in it, as well, so you'd have to adjust the proportions of acetone and water. Easiest way is to get a 5 gallon HDPE carboy (Utah Biodiesel Supply has them for $16 each), put your acetone / water mix in, put your gasoline in, then look on the bottom for any water settling out. If there is, add small amounts of acetone until the water is miscible with the gasoline.
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