at least with an A you won't drive of with the pump nozzle still in the tank. or would you ?
My wife made me a nice diaper, the color of my car, that goes down around the filler neck of the fuel tank and I set my cap on it while refueling. When I lift the diaper up, I pick up the cap also and wipe any dribbles that may have gotten on the paint. It also catches a few splatters as I'm filling the tank. I haven't lost a cap in over 14,000 miles of driving.
Glen