I agree that the transmission shifts to 9th too soon and i can hear the engine laboring a little at the low rpm at 60mph. That being said, I don't get any jerking, bucking or lurching and IMO this is an unacceptable condition. Yes, the car shifts to 9th for better fuel economy too early and that's not good for the engine but it still shouldn't buck and lurch. Mine doesn't. I do run nothing but premium fuel and that may or may not make a difference?
I was thinking maybe his is doing it in a lower gear, at a lower speed, and possible being the cause of the lurching, etc. Granted, his situation is much more extreme than anything I have experienced in 9th at 60 mph. I'm following to see what his outcome is.
2018 Premier, 2.0T, Cajun Red