I have gotten rather spoiled with fogging my Evinrude Etec outboard. It literally takes less than one minute to do!
http://www.youtube.com/watch?v=PvNBF8Az0ic
Hopefully other outboard manufacturers will follow suit.
To answer the original question, I would fill your gas tank as full as possible using a marine fuel stabilizer like the blue Stabil, Startron, Valvetech, etc. Make sure to run your outboard some to ensure the stabilized fuel is in the engine. Fog your engine per manufacturers recomendations, then wait for ice out!!
I firmly believe that with the new ethanol laced fuels it is more important now than ever to fog cylinders. Alcohol (Ethanol) is a cleaner and it removes whatever lubrication is on your cylinder walls. Fogging at least adds some sort of long term protection to help against corrosion. Plugs are cheap, cylinder walls are not...
Good Luck!
Dan
Dan