From what I have seen / heard, it is only the cover that has been ripped off. I rub there a bit under full stuff, but it hasn't ripped off yet.
I have not heard of anyone actually having the fuel tank filler ripped off, just that cover, as it seems to protrude out further, for "protection" purposes.
-Jeremy
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"I'd like to move us right to Peter Gibbons. We had a chance to meet this young man, and boy that's just a straight shooter with upper management written all over him." - Bob Slydell (Office Space)