Originally Posted by b5blue
Don't be so paranoid. I would bet you left it at the pump, easy to do when your distracted by someone checking your ride out. No need for a new gas cap just stuff a rag in the hole, seals the filler tube and allows you to easily wipe up spills.
Also provides excellent street cred. It says, "Yeah, I have the money for this car and I don't even give a shit about it." Instant respect.