Hey, I thought this article might interest some of you. I copied it from another site. Do you know anything about this, or tried acetone in your gas tank? Some guys were reporting improved gas mileage, some were saying the improved gas mileage came from removing gunk & tarnish, and some said that the acetone will attack rubber parts:

Subject: Acetone in Fuels (A Study of Dimethylketone or Propanone)
Author: Louis LaPointe
Date: February 11, 2005

(c) Copyright 1990-2005 Louis LaPointe All rights reserved

Significantly Improved Mileage:
This article about acetone (CH3COCH3) probably draws conclusions that Big Oil and the American Car Manufacturers and others do NOT want you to know. They suffer from unlimited corporate GREED. They want bad mileage. The worse, the better as far as they are concerned. Acetone is a vaporization additive rather than a fuel additive per se. It is successful in very tiny amounts from about one part per 4000 to one part per 500. Mileage seems to taper off while HC emissions actually are greatly reduced with too much acetone. Acetone not only improves mileage but cuts pollution and gives longer life to engines. The peak gain in mileage comes between .03 of one-percent and .20 of one-percent acetone, depending on the actual vehicle which may be running gasoline or diesel. Note .781 cc per liter or .78 parts per 1000 or one part per 1280 is the same as one ounce per 10 gallons. Acetone operates on the unburned portion of the fuel through better vaporization to improve combustion efficiency. Acetone further operates like an electron absorber. It is the ideal additive for gasoline and diesel fuel. There are no bad effects whatsoever and every good reason to use acetone in your fuel.