Alright guys. I got a check engine light and took it to the dealer this morning. He calls back and said that they ran a diagnostic only to find out that the aftermarket CST locking gas cap was the culprit. Loose thread.
$109 since it's not covered by warranty! Woulda just been better off getting the DefenderWorx.
Lesson learned.
UPDATE: Service Manager was cool enough to let me slide on this one. Think I'll invest in the DefenderWorx now!