335d e92 2009 Efficient Dynamics model.
Rush hour town driving : 27MPG
Mostly Start stop for 1 mile then slow moving traffic a further 2.
Non rush hour town driving: 35MPG avg
3 miles 30mph, stopping only for traffic lights and light traffic.
Motorway Drive boring: 70 mph: 48 mpg
40 miles motorway mostly flat with some uphill section. 5 miles of town driving.
Motorway driving, errr, others 
: 43mpg
Same as above but with, lets say a heavier foot on motorway.
All averaged not single trips.