I thought I was never going to ask another question here seeing that I am getting a new car ( In a few hours) but that car is a Chevy Sonic, which replaces the Aveo. Here is my question " On the 2014 Chevy sonic ( not sure about the LS model) there is what looks to be a fuel door latch. The salesman says no, but it is clearly a latch. There is nothing about it in the owner's manual that I downloaded but it is a latch and my 10 year old Aveo had a latch on the fuel door so it makes sense Check out the image If it is a lock how does it work? I will check it out on my car when I pick it up and give the answer if no one here knows.
http://www.digitalart.x10host.com/lock.png