Ok, off topic just a little, but GM didn't copy Ford's tailgate step for bed access. The recessed step pads in the bumper work much better, less expensive, lighter than the Ford contraption. But they're so distinctive in appearance, no one can copy them.
Things that are hidden u dear gas flaps are fair game I guess. I have a '16 with the prehistoric screw-on cap and tether. Now that many of the gas stations in my area have removed the little ratchet stop for the gas dispenser, my gas cap serves that purpose completely. In this case, I think I have the better option.