Well...got it back tonight. It was the gas cap and they also did a PCM flash of some sort. I'm not sure what it was "upgraded" to as the paper says since I didn't have the 60 MPH hesitation some of you have but whatever...preventative I suppose. Got my worst tank of fuel so far too...I was going higher and higher each time...19, 20, 21, 22...now...16.6. Oh wellz.