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I have used it in my boat engine for a couple of years. Recently took the carbs apart and they were super clean. I am thinking that the startron had something to do with it.

Use it all the time!

I've used Startron religiously for about two years. I haven't noticed any improvement in performance or mileage. I use it mainly to stabilize fuel and help prevent phase separation in ethanol fuels (with resultant accumulation of water) in my vintage bikes. So far, so good, and I'll continue to use it.