Mine has almost done 10,000km now, driven mostly against the rush hour. At the moment the car computer says 13.2L/100km, and it was reset about 8,000 km ago.
I do spend about a third of the time with the M button activated on the hardest setting, the setting I use when I drive home from work.
Best mpg so far was 10.6L/100km...when I first reset the recording and was on highway for 200km. After some mixed city and highway driving it settled at 12.8 at first and now has slowly crept up to 13.2.
Worst was 16.7L/100km for one full tank of petrol, just so happened that I had to travel in rush hour traffic everyday for a week (well, that tank didn't last the week)