I bought this truck from a contractor, for five hundred dollars with over 200,000 miles on it. I started using the fuel treatment on every fill-up since owning the truck (almost a year). In Cuyahoga county, you have to have your emissions tested every other year. The maximum allowable is 220 ppm (hydro-carbons). My truck scored an amazing 3 ppm! To everyone at Lucas: GREAT JOB!!