i allways used a $.99 gas additive from walmart, and never really noticed anything. one day at advanced auto, i decided to buy the lucas oil stuff. at first i bought the one use bottle for like $4 and my mpg went up about .5-1 after a tank or 2. seeing that, i bought the bigger bottle and my mpg went from 13.8 to 15.8. ive waited to make a thread, and ive gone about 6 tanks of gas. no high way, just town driving.
does anyone else have any positive experiences with gas additives?