All you folks concerned about dmage, please do some research. Many folks have done experiment soaking various rubbers and plastics in gas with much higher concentrations of acetone- no problems. Also, I have read that acetone is the main component in many off the shelf additives.

The amount being proposed in tiny.

I believe that the bigger mpg increase will be realized with less efficient engines, esp those with carbs. I'm gonna try on lawnmowers first.

As to why isn't already in gas if it is so good? As with anything, follow the money.