FWIW, I fish almost every single weekend(missed 1 this year) from March, 'till October, with a 2-stroker on my Walleye boat, and an I/O in my Starcraft.
I have NEVER, purchased 1 oz. of gas from a marina pump, and only had 1 issue(prior to the use of Startron) with the carb on the I/O. Plugged jets, from the ethanol.
Cleaned it, and it has been fine since.
I have religiously used Startron in all my outdoor power equipment, for some time now, and all run fine when they are put in service.
One thing I have noticed is that how quick they start, with the additive.