I used 6oz in each 20 gal fillup in my Explorer for a several months last year and saw: a) an increase of 2-3 mpg, b) an elimination of ping, and c) more 'seat of the pants' power. Then my can of acetone ran out and I ran about 5 tanks of regular unleaded. The 'ping' has not returned, but my mpg has significantly dropped, and the 'pep' is not in the motor now. I'm picking up another can next time I'm at the hardware store.