I am actually going to try adding acetone to my fuel for the next five tanks. I go through a tank of fuel(about 300 miles) every week, so I will report back in about 5 weeks. Right now, my YJ gets about 18 mpg, but has not got me more than 19 mpg since I started my commute to school mid-august. We'll see if it actually does help on our Jeep engines. Also, I am not worried about it doing damage to my engine since it is diluted so much. I have tested the e-85 in my engine, along with other fuel additives, so I am not worried if damage does occur. Also, I have my 4.6L stroker almost finished, so my old engine will be written off in a couple months anyways.
99 XJ Cherokee, 2 door, 4.6L Stroker, 5 speed, 4x4, 8.25" rear, 3.07 gears