Sea Foam is naphtha with some oil added. Naphtha is also sold as Coleman Fuel. I don't know what effect it has on mileage, power, etc., but it works well to clean carbon out of 2 stroke engines and throttle bodies.
Seafoam was originally developed for the marine industry to clear engines of carbon and junk without a tear down while at sea. They've also got a penetrating oil and transmission cleaner. Oddly, Seafoam also works in the crankcase to clean sludge in the oil.
Our local farm dealer where I buy my parts and supplies sells this stuff by the case.
The manufacturer claims that it can be used to stabilize fuel over a lay over and to clean an engine crankcase. I've used it a couple of times to clear water in the tank. Seems to work pretty good.
Proud owner of Stinkerbutt!
-Air Raid cone filter, direct to TB
-Homebrew front air dam
-Homebrew side skirt
-Torza top bed cover
-Now featuring front wheel canards!