Has anyone tried Archoil AR6200 fuel additive? I have, and I'm a firm believer. My MPG's got so much better, especially on the highway, the car idles better and the injector "tick" is a bit quieter. Plus it is a fuel dryer, I did an ethanol test at the Shell station where I usually get gas, 93 octane had about 9% ethanol, when I added the archoil, it went down to 1-2%. Im looking into trying their oil additive, AR9100 Friction Modifier. Archoil is popular with Powerstroke owners because it helps with injector stiction, but it can also be used in gas engines. Its good stuff