I shoot for about 2 oz per 10 gallons (2 shots from a shot glass per tank). I use the Home Depot Grade (~95% pure?) I ran it every tank but ran out and have not gotten more. I do it on long trips where I use more than a tank. I only use my 4rnr occassionally and the acetone seems to "spoil" the gas after 2-3 weeks. It results it 13-15 mpg for the remainder of the tank, so I don't use acetone when I'm not driving it much. That part I haven't proven. The 20% increase in mileage I have proven over and over and over.

85 4Runner, 4" lift, bumpers, sliders, locker