Dear AquaTune,I started out as a very skeptical customer and I also took the liberty to call your distributor in California to ask him what their overall results were on my kind of vehicle. Because of the favorable report, I decided to order the AquaTune unit for my '89 Toyota Celica, 1.8L engine. I used to burn a tank of gas per week. Going the same distance every single day as before, in other words, driving to work and back, traffic and all. You can imagine my excitement when after a week I was down only ½ tank of gas. I didn't realize that this vehicle could run so smooth. And horsepower – lots of it! Love these results, terrific. Thank you, Hector C., CaliforniaP.S. – I'll be ordering a second unit for my Mazda MVP shortly.