I seem to remember a post several months back on the topic. Try the forum search feature.
AFAI remember there was a bit more slithering...err umm the results were inconclusive.
Acetone is used as a fuel cleaner ingrediant and if your intake system is a bit gunky then it will probably help. But there's no majic in the chemistry. OOps and use it in too high a concentration and you'll find out how acetone resistant some of the plastic parts aren't.
In addition to anything high concentrations of acetone might do to the seals and plastic parts of the fuel system, it is also highly flammable.
Years ago I used fairly large quantities and purchased the acetone in 55 gallon drums. The drums had to be grounded to prevent the possibility of static sparks causing an explosion. Just something to consider if you decide to make use of it as a fuel "enhancer".
It seems plausable. The acetone allegedly reduces the surface tension of the gasoline, making it vaporize better. The experimental results and reporting seems too in-depth to be a hoax. However, I have never tried it myself.
I am trying it in a V6 mustang stick, just added it today to a full tank. I will know in a week what it does. From what I read and the way it works its going to do less in a very effiecent engine that already burns most of its fuel and more in a less sophisticated engine.