I've always been a believer that if it's been around for a while and sounds too good to be true, then it probably is. It doesn't take long for Americans to exploit something. Think about the marketing potential for a gasoline company who used the additive "super gas", the car manufacturer who could say "acetone friendly cars, save gas, go green", chemical companies that could sell to consumers instead of bulk discounted sales. I saw it discussed about a year ago and gas companies still aren't using it for some reason or another, take your pick:
1. doesn't work
2. bad for engines/voids warranty
3. not allowed/federal regulations/harms environment
4. too expensive (can't be the reason since gas companies would buy in huge quantities and it's already economical enough for consumers to try)
5. they don't know about it (yeah right)

To each his own, but I'll stick with regular gas until I hear a major company who's afraid of lawsuits, say it works and is safe. Without a controlled study, it's all seat of the pants speculation.

Just my 2 cents.