Averaging 50 mpg (5.65 l/100) + combined driving and I live in a hilly rural area! But I have seen up to 75 mpg (3.77 l/100) returns on steady flat motorway trips
very happy with 120D Auto box economy in eco pro and performance if switched to sport + (but I will definitely re-map when one becomes available)
Additional note: The terrain you travel over has a major impact on fuel returns, hills totally ruin any decent mpg.... You could be down to 20 mpg (14.12 l/100) or less on minor gradients