I'm in the middle of an economy run at the moment. Trying to hyper-mile (drive as absolutely efficiently as possible) for a whole tank of diesel to see how close I can get to BMW's claims. Hard to say at this point how it will go but I was quite disappointed with the economy to date. I've only had the car for 3 weeks but I've done 2600kms and it is averaging 7.44 litres/100 kms (37.97mpg UK or 31.61mpg US).
I mostly drive in town with a short motorway stretch on my way to work. Traffic lights are killers for fuel economy
Will be very interested to see what I manage to get out of this VERY anally-retentively driven tank. You can see my figures here:
http://spreadsheets.google.com/ccc?k...wewyd_HNDcvCBw