Real quick - I agree with the above....I ran about 10 tanks with acetone and gained about 3-4mpg.... I switched to my 20 rims and 31 tires which are heavier than my 265/75-16 and now without any acetone I get 17.1-17.4 mpg (compared to the last time I ran this setup I was getting 13.6-14.1) The VX just runs cleaner now.