Cars are not the only things at risk. When I lived in WI, I had a John Deere BULLDOZER with a gas engine. Used it to move the snow out of the yard in winter, and other things in summer. One day, I filled it with gas and worked it for about an hour and planed to finish the rest in the morning. But, in the morning, the tank was empty. Again, I filled the tank and nearly finished what I was doing., I left it parked there, near the road, but this time, I drained all the gas out of it, and turned off the gas line. Nearly filled it with water, and about a quart of gas on top.

The next morning, there were two cars parked on the side of the road with the hoods up.Four kids in their late teens were trying their level best to get them running again. On my way into town, I stopped to see if I could "help" They had the aircleaners off, and you could look into the carbs and see all the litle droplets of water I even hooked up jumper cabl;es for them to be able to crank the engines more (and burn out the starters). The finally had to have them towed away, and I was never missing gas again