Hi LAF... I use the grey PS. About 8-10 ounces a tank full. What I did was saved 2 of the smaller bottles, bought the big jug, poor 8-10 onces in the small ones, carry'm in my bed box. Use & refill, Use and refill. I don't add it at each and every fill-up, but use it regularly.
Good stuff, I think. I can tell the dif. with it or without. Especailly towing.
Good stuff, I think. I can tell the dif. with it or without. Especailly towing.
