On 08/05/2016 1:56 PM, Jake wrote:
....

As the OP stated, it all depends on humidity, daily temperature swings
and how well the tank is sealed.
Personally I wouldn't worry about it and if I did, I'd use ethanol free
gas.

See the follow-up; the point was asking if OP had any evidence of it in
a vehicle, _NOT_ in UST or thru deliberate or accidental introduction of
water but by condensation.

I went ahead and did some calc's; it's essentially impossible starting
from uncontaminated fuel to introduce sufficient water volume that way.

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