Quote:
Originally Posted by ermax
Ethanol absorbs water which is bad for engines. This isn't really an issue if the car is driven a reasonable amount. It's only really a problem on lawn equipment where you put stuff up for the winter or in a boat where you put 300 gallons in it just before the end of the summer and then it sits all winter.
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The moisture issue comes up if you DON'T fill your tank before putting it away. Cooling cycles will cause the moisture in the air in the tank to condense on the inside surface of the tank and run down into the fuel. An emptier tank --> more air volume --> more moisture available to become condensation.
If you fill your tank completely to minimize this volume of air, you minimize the amount of moisture in your tank. The downside of that is that fuel left for more than a couple of months will start to go stale, so it's best to add a bottle of fuel stabilizer before putting it away.