The one 4 door I test drove back in the end of June had it real bad. I was the first one to drive the car. after the dealer got it ready from the truck. They had to do something to the car so I could drive it. Don't remember what that was, but I do remember they had to unwrap the seats. That car had the worst case I've felt. The other three I drove all were fine. All test drivers had less the 20 miles on them.
Mine has over 6600 miles and still studders, I can feel it everyday. The service manager tells me to wait until around 9000 miles and it should go away.
As for the gas idea I have run more then three tanks of 93 octane from the same station thru it and the studder is still there.
opie, are you sure? I know your in the bussiness.