If you really care that much about gas mileage, you would rockin a hybrid right now. all this effort for 3-4 mpg? who cares. lets say a 17 gallon tank, which would then equate to 68 miles extra on a tank. 68 miles at 25 mpg then = 2.72 gallons saved on a tank. 2.72 gallons x $3.79/gallon (price of gas out here in orange county CA) = $10.31 a tank saved. Oh subtract the $0.50 a tank for acetone per tank, then comes out to $9.81. Im not sure how long a tank lasts all of you, but im good for about 1.5 weeks. SO, in a year (52 weeks) I MAY have saved a MAX of $340.08...not too bad, I would love to save myself $340.08 a year! Here is the downside of it ALLLL...You don't seem very mechanically inclined, especially if you have to take advice from your MECHANIC *cough*. Is your mechanic going to cover the parts and labor for any damage that may be caused by doing this? There is a potential for even premature engine failure if the cards get stacked right. So, save $340 a year and gamble for a new $2000+ motor from your trusted mechanic, or just keep it simple w/ good ol' 87 octane? hmmmmm. BTW, you are giving amateur mechanical advice to people who potentially know NOTHING about cars other than "ICE" and exterior "MODS", not a very good idea