The same way a customer can buy a new push mower run it once, and then won't start , and the customer stands next to me while I drain half a tank of water. Or the lady that had me test the fuel in her five fuel cans, and find E10 in all five, but the riding mower has E85. or the customer that says they just purchased that fuel yesterday, at the same time they filled up the tank on their car, and won't ignite even with a propane torch.
Different storage environments can have drastic effects on fuel.
Different storage environments can have drastic effects on fuel.