Just learned this today. I picked up my plastic jugs to take them to the service station to get some fuel for the tractor. I left them outside yesterday, knowing that today I would be going out, and I might forget to get fuel. When I picked up one of the containers, it rattled. There was a little fuel left at the bottom, and apparently water in it turned into ice. I haven't done it yet, but I will pour what fuel is left in that container into a plastic jug, then bring the plastic jug into the cellar to thaw the ice so I can pour it off into the snow.