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...that's a VERY interesting question, to which I can personally relate an answer!
...back in 1969, while flying in USN, we flew down to Acapulco, Mexico, to chase a tropical hurricane; the only problem was the only AVGAS (115-145 purple) they had there was left over from WWII and it had slimey green algae growing in it (and entrained water)! So, we had to "filter" every gallon pumped from their tanks through 'chamois' skins...and our EC-121 Super Connie held 8,758 gallons of gas!
...don't know how "long" that gas had been sitting, but from 1945 to 1969 is 24 years. The gas (after straining) was basically 99% usable, as the flight engineer said he only had to slightly back off on the ignition advance during METO power at take-off.
...by 1969 the Acapulco airport was handling only jets.
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