I got some info from this website http://www.lubedev.com/smartgas/ultra5.htm . I'm thinking of going with the acetone in the tank. 2 oz. for every 10 gallons. any thoughts?
I use it all the time. Get a 10% gain with all my vehicles. On my truck it is most apparent as when I don't use it not only my mpg drops, but the engine's smoothness and responsiveness as well. Same with the Saturn SL1. With our Honda Odyssey, the mpg goes down but since the engine is so smooth anyway that doesn't go away.
By the way, it won't harm your engine. I've been using it since last year and drive 25000 miles a year while the wife drives 15000 miles and I am on my third gallon of acetone to date.