1350 is right. this too would produce all the great effects of acetone... NONE!!

If your car is pinging so bad that adding a non-petroleum solvent to your fuel makes it idle smoother you need new rings and/or pistons and/or a valve job. your not prolonging the inevitable, your actually speeding it up by breaking down your oil via contamination. If you think injecting acetone into oil wont change its PH and acidity you´re dead wrong and your car will pay the price.