Originally Posted by JimBlake
If you want to clean up stuff every once in awhile, don't use high-octane to do that. Pour a bottle of Techron (or whatever's your favorite stuff) into the tank. Higher octane & better cleaning are two completely different things.
Modern gasoline has so many additives and detergents in it to do that that it's really pointless. A can of Seafoam used in the intake and the crankcase would do wonders more for your engine.