The 330D LCI 242bhp is more efficient than the earlier 330D 231bhp, official figures (not to be believed!) are below.
Urban 37.7
Combined 47.9
Extra Urban 56.5
Bottom line is if I am getting 38.7mpg (which fuel comp tells me) just driving round towns and B roads, I would expect at least another 5-6mpg when at motorway speeds.
According to BM forums average seems to be around 45mpg on motorway runs (@ indicated 80mph), for me that is very economical
, the best I saw on the edition 30 for the last 4 months was 29mpg on a motorway run and 24-25mpg on the B roads
I did not buy the car purely for economy
, if I did that I would have bought a 318D, I wanted a car that was quick AND economical along with more room for my sporting gear (had 3 sets of Golf clubs in it this week without seats down).
The car does exactly what I needed and I am happy with it.
Not sure about same gearbox as 123D, yours is a 4 cylinder mine a 6 cylinder, not sure of gearboxes are identical?, I know at an indicated 80mph its doing about 1850rpm and showing 46.2mpg (It did on the 45 mile drive back down the A30) which was 2/3rds dual carriageway and 1/3rd single A road.
If it "Only" does 40mpg average on the run I will be VERY happy anyway, diesel is the same price as Shell V power unleaded so im saving on fuel (and car tax by £80yr and insurance by £300yr)