Well, I didnt expect anything but received 2 of these for fathers day and thought Id try them out. I was surprised when my fuel economy in my lexus IS300 went from around 10.3km/l to averaging over 11lm/l, with a best of 11.4km/l I also felt that acceleration was stronger. I delayed leaving a review but now, after about 12 tanks for fuel I can confidently say it works. Will be buying more for our other cars
