Have you ever considered asking a chemist what properties acetone has that might affect the function of gasoline in your engine?
Every testimonial about acetone in engines has something to do with either surface tension or atomization, neither of which is a problem in modern vehicles. Why do people still bother with this stuff?
How about calling Shell and asking about the formulation of their fuels... It's got acetone, xylene, toluene, and probably some heptane in it. Not to mention things like MTBEs and probably 200 other aromatics, and now it's even got organic alcohols in it, like ethanol.
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