My two cents. When the car is locked, the fuel door locks too. I found this out when selling my son's crossfire, recently. (I have owned a Crossfire since 2005.)

The gent who was buying the car asked about opening the fuel door. I went to show him and it wouldn't open. I did everything including ripping the door cover off in my hand before I came to the correct conclusion. My wife locked the doors.

I love you, honey!!!