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Old 08-13-2011, 08:57 AM   #4
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,273
With stabilizer added and thoroughly mixed, gas with up to 10% EtOH is good for about 2 years. By itself, about 9 months to a year is about the limit. When you get home, add Stabil to the tank and then take the car for a brief ride to mix it in and you should be fine.

Corrosion from water separation has become a significant enough issue that many OEM’s, Porsche included, that they have begun recommending using additives in all alcohol containing gas, particularly in damp environments, even if the car is a daily driver.
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