Well, shoved a new k&n air filter in there and there was a slight improvement..
I also drove around looking at the current consumption screen and noticed something which I wonder if it normal...
Upon normal/conservative initial accelration from a complete stop, consumption reads around 70L / 100k. Then drops gradually to between 6 and 7 L when cruising at 50km/h. Acceleration reading seems astronomically high to me...