[Gary in NJ]

Ethanol-free does store a lot longer then fuel with ethanol. Further, in-ground fuel storage tanks do not have the wide temperature fluctuation that a car fuel tank can see (the in ground tank with see +/-2 change during a day while a car can see +/- 40). It is this wide temperature change that causes water to accumulate in fuel. In short, I think you are WAY over thinking this.

He's a idea, why don't you ask the station owner how often he gets a delivery. That will tell you how long the fuel has been in the ground.