Acetone like methanol would be better if "pre-mixed" with the fuel before being added rather than poured in before or after petrol, and tbh i have been told by my chemists here at work (i work for ici) to "if in doubt stay well clear":(
I have also done some testing here on our mass spec machine with different combo's of fuel (starting with ultimate, and tesco 99), and have come up with a mixture which contains some cancergenic gear incl toluene, but no acetone! (as toly is also a very good inj cleaner..)...
The reason i started playing around was because of the cost of race fuel such as C16 etc....