I have now done 31k miles in mine ... Overall it has averaged 38mpg (uk)
Short town journeys pull it down to mid 30's
My 60 mile return main road/motorway commute gives me between 40-43mpg depending on traffic conditions.
I have just come back from a Xmas/new year trip to family in the west of Ireland in pretty horrid conditions fully loaded to the roof with presents and the wife's shoes and a change of jeans for me it averaged 39mpg over nearly 2k miles
So a little bit thirstier than a 20d . But what an engine the 23d is
))))
It is also X drive rather than S drive
The sister of my neighbour has an s20d and she says (unverified) that hers averages 50mpg
That is worked out the old fashioned way from fills not obc reading .. But the figures aren't far apart
__________________
Gone: E90 crimson red/black
Gone :X1 23d Msport manual, Space/Beige Pro Nav, Adaptive zenons, privacy glass, 18's, ext storage,
Current: X3 20d Xline auto, Melbourne/Beige, Sport seats, Viz pack, heated steering wheel, Folding mirrors, privacy glass, luggage net, pro nav
Current: E85 Z4 3.0si roadster titanium/Syrah individual
Current: F31 320d touring black/black work hack