I have the 2.0D with 7000 miles and am starting to average around about 42mpg which is a combination of motorway and around town. I have however been driving with the 369 19" alloys on which I know make a difference.
I have recently put a winter set of 17" wheels and alloys on and have immediately noticed an increase to about 45mpg. So I would say the wheel/tyre setup has changed the mpg.
I would hazard a guess that another 5k miles or so I may get another 1-2mpg improvement as well with the engine settling in.