LittleJohny
Go Kart Champion
Another fun fact - if you lock the car with the gas cap open, you can't actually close it without unlocking the car again.
Or, if you lock it when you get out of the car, realized your mistake, and unlocked it... the gas cap will open.
But the 30-second rule still applies - if no doors are opened (fuel door doesn't count) within 30 seconds, the car will re-lock itself. So, as you fill up, the car will lock itself again, and when you finish fueling and try to close it, you will wonder why the heck it won't close.