Re: Huh?
My current car has such a bracket, but my previous car had such a discreet arrangement that I didn't notice for about 2 years - the fuel cap had a couple of notches in the side, allowing it to perch atop the flap. It was also tethered so couldn't be removed entirely. A brilliant bit of design, masked by the fact that nobody knew about it - I told several other owners of similar cars who all responded with "wow, never knew that!"
Prior to that car though, there was no such arrangement. The cap either got placed on the pump, or on the car roof. I never had a problem with that either.