Now that might actually be a valid concern. Alcohol will absorb water - even water from the air. On the other hand, unless your vehicle sits for extended amounts of time with a half full tank, how much moisture laden air vapor gets in there? It isn't like there is a fan or something constantly bringing in fresh air.

As long as you burn a tank of fuel within a couple of weeks, I wouldn't imagine the amount of water vapor aborbed by the 10%-20% alcohol content of the fuel would amount to much.

Also, if you are letting your vehicle sit with a half tank of fuel for months on end, even without alcohol in the fuel there is going to be some moisture condensing on the exposed inside walls of the tank and settling to the bottom. That being the case, would it be better or worse to have that water aborbed into alcohol passing through your injection system - rather than having it pass through as pure water? I would think it would be better for it to be absorbed into the alcohol...

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1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
2nd owner & 2nd engine in an otherwise
99% original unmolested car
~210k miles on the clock

1986 Ford F250 4x4 Supercab
Charcoal & blue two tone paint over burgundy interior
Banks turbo, DRW, ZF-5 & SMF conversion
152k on the clock - actual mileage unknown