Back on subject:
The primary route for water contamination in fuels was determined to be via condensation in fuel tanks, not by simple contact with damp air. The droplets would sink to the bottom of the tank and be absorbed by the ethanol as it broke down by phase separation, which could take weeks or months, depending on conditions.
According to CSP (
https://www.cspdailynews.com/fuels/3...ase-separation) it only takes 40 gallons of water in 10,000 gallons of E10 to cause phase separation. That's 250:1, so in a 50 litre Logan fuel tank, just 20cl of water would do it.
That's less than a pub measure of spirits!