Originally Posted by fixer67
Not all types of alcohols are the same. Alcohol in the fuel is part of the problem to start with. Gas Dri uses METHYL alcohol which bonds with the water letting it burn off along with the gas. Now ETHANOL which is added to almost all gas now days is a type of alcohol, that will pull moisture out of the air via you fuel vent does not bond well with water. By itself it bonds with water real well but when gas is added to the mix the ETHANOL trades the water for gas letting the water settle to the bottom of the gas tank. So you are getting water in your gas right out of thin air. So why do they use ETHANOL and not METHYL alcohol, I can only guess it comes down to cost. I do not know.
That's somewhat of an over simplification.
I worked gas stations for a couple years at places that used a 10% Ethanol mix. The water level indicator ALWAYS registered at 0.00"!
Obviously, if ANY water was in the gas, it WAS absorbed by the Ethanol.
That said, if allowed to sit for a long time, I think ANY type alcohol will absorb moisture from the air. It's a relatively slow process however. FRESH "GasAhol", WILL remove condensed water from a fuel system as a quick fix.