Hi Skippy, thanks I stand by techron for in the gas tank, but I use it maybe once per year. I don't want it to eat up the piston rings, and other gaskets if I use it too much. I wonder when a good time to replace the injectors is? I have 215,000 on the truck..... I assume the larger the hole in the injector the more fuel that is entering the chamber and being burned up which would decrease the MPG's allot.