I just started adding 3 oz acetone / 10 gal. gasoline to a little KIA. It normally gets 32-33 mpg or so. The car has about 55K miles on it, and has a standard trans. I'll report results when I get them.....
326 miles / 9.3 gals gasoline = 35 mpg
not as good as I'd hoped, but perhaps another example of how little engines, that are very fuel efficient, do not benefit as much from acetone additive as larger engines...
I'll try another tankful and see what happens.....I am using 9 ml acetone/gal. of gasoline