because the the Max Mileage is giving me no gains. The only reason I pulled the Power Puck is because it was causing my truck to stall, but hopefully that was because of a bad connection. I went ahead and put some dielectric grease on all the connections and hopefully it will fix that problem. When I was running the puck before it gave me about a 1 mpg gain and the Max Mileage gives me nothing. The puck also gives me 90 hp so its a little more fun to drive, though I hardly ever get on it because I don't want to break my tranny.