Assuming from your previous post that you would prefer a manual tranny, the 2.0 test is out and the result is 22/30 MPG vs the 3.2 at 17/26 for a difference of 5/4 MPG.

Granted you are looking at a manual vs auto transmission, but I doubt the manual will be matched to the 3.2 next year anyway.

Plus, unlike a diesel, you actually save thousands by switching to this engine. And with the transmission change, the 0-60 times are closer to the 3.2, though of course not there. But if you really want the smoothness of the 6, chances are nothing will really convince you to switch. I am having a hard time with that part myself.