Not finding an answer elsewhere, I thought I'd post all the details here for the Faux Gas Cap on the 2011's. *I was intending to replace it with a decal... Here's the Faux Gas Cap: Here's what it looks like underneath: *Notice it is NOT a smooth surface under there! Any kind of a flat badge or decal will NOT work here! The back of the gas cap, and the 2 plastic collars that hold it in place: Close-up of the collars: I wanted to replace the cap completely, so I had a decal made to fit there. It's a flat decal, pretty good-quality, just what I wanted, too... The decal is 7" tall x 8" wide. The "3D effect" is printed on, looks pretty good in-person. **Anyone want to buy a custom decal? Tri-Bar Pony! $50 inc. shipping!