I must correct you rsg3, higher octane fuels burn at a HIGHER temperature. That's why you cannot pour CAM2 racing fuel into your stock motor, it would burn it up. I use good brands of gas (Exxon, Mobil, Amoco), so I couldn't possibly get a better quality than what I am already using. I don't need any fuel system cleaner, the truck runs fine. No knocking or pinging, plenty of power. Was just looking at the plugs out of curiosity. You are aware that alot of theses "cleaner's" will foul your plugs, aren't you? Techron is one of the few that will both clean your system, and not foul the plugs. Ask your mechanic, that stuff is the best on the market.

Bill