One point folks miss is that summer gas ain't winter gas. In the winter more lighter hydrocarbons are added to allow the motor to fire off on a cold day.
My 2 cents is to keep fuel tanks full with fuel stabilizer. I always added the old OMC 2+4 and never had problems.....except trying to run winter gas through the anti-siphon valve. In the south refiners start to add butane in November, when a vacuum is pulled by the fuel pump, it often vapor locks. I had a Grady White that would vapor lock on the main tank and the aux tank ran fine. Finally I took the spring and ball out of the anti-siphon valve, no more problems.
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