scott,
i suspect your are in a dryer climate with smaller temp swings than we are here in ohio.
we get condensation so bad it drips off of cars at certain times.
motorcycle tanks around here being eaten alive with corrosion and on older bikes the rubber parts are disintegrating. Unfortunately the Japanese have not changed their rubber compounds so your 10 dollar o ring is gone in 6 months. There is no alcohol free gas within 100 miles of here.
I poured out a quarter cup of water from a lawnmower that is used every 2 weeks. The only way to fight it is to run as low as possible all the time
keep the least amount in the tank. Google gasohol phase change! What a joke!  On the eco modders forum a fellow took 5 gallons of gas and ran the miles covered that he got from it then he took the alcohol out of exactly the same gas and ran what was left  over the same course and got more miles from a lesser amount of fuel. this test was repeated several times with the same results. I am getting a hit of about 2 mpg on my 85 westy. that and lots of small engine problems mean I am out of pocket several hundred dollars a year, not to count how much of the taxes are going to subsidise the food based ethanol and the rise in corn prices which affects most other food prices, notice any rise in your grocery bill?
rant over
mike