I use it because every comment I have seen on it says it is the best thing ever for cleaning fuel systems and improving performance. I thought it would replace Stabil as a stabilizer but I have since learned you need both, One for cleaning and one for stabilizing and protecting against ethanol, if you buy that kind of gas. So far, I've only run non-ethanol, but you never know for sure what you are getting.
My outboards are old, so I need all the help I can get.