I drive a 1988 Mazda B2200 with 135,000 miles on it daily. During the last 6 months, I have been having a problem with stalling, low rpm’s, bogging down under acceleration, and dropped from 22 mpg to 19-20 mpg. I replaced the plugs and retuned the engine…no luck. I used everything from trans fluid, kerosene, to STP gas treatment, no luck. I even replaced all the filters (air, fuel, PVC valve) still poor performance. On a whim I tried your B-12 Chemtool. After half a tank, I noticed a big difference. After driving until the tank was almost empty, I refueled and added another can, but noticed that my mileage rose to 23.9 mpg! Wish I had noticed your product earlier! I just want you to know I will be recommending this to all my friends.