"Al Bundy" > wrote in message
oups.com...
Much
> of the fuel sold today already has alcohol added as an oxygenate and
> that will absorb some moisture.

Very true.

The problem is that once the saturation limit is reached for
moisture in the alcohol fraction, precipitation will occur. Not only will
a large portion of the water settle out but it will bring a good bit of the
alcohol out with it. At this point, it is very difficult to put the wet
alcohol and gasoline back together again.

A good dispersant can be a helpful additive to gasoline, especially
during the colder winter months and in high humidity situations. A lot
of additives are based on alcohols alone, but the better ones contain
surfactants which help keep any moisture moving.