| drain ALL fuel from your tanks
i do the exact opposite. draining the tank would not prevent condensation on the sides of the tank and you could have water waiting for you in the spring when you fill it back up. it's not the gas that goes "bad", it's the tank walls that collect water out of the air when the temperature changes...
the advice i've gotten from mechanics and motor-specific discussion sites is to make sure your tank is full all the way up. not only is this much easier than siphoning 20 plus gallons of gas out, but it means no exposed space for water to possibly condense on the sides of the tank. be sure to leave a very little amount of space at the top for expansion and do not cover the vent. add Stabil, be happy.
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