Well I actually received my first bottle a Slick 50 free and it seemed to make a difference , mileage did improve as I ran the numbers every tank full , It was my first brand new car I ever got and i was keeping fastidious records on every thing. Got hit by a truck and car was a complete loss. Have tried it in several vehicles since then and no difference in mileage observed. You will find as many people that swear by it as people that swear at it.
