Something which you need to bear in mind when comparing fuel consumption figures for diesel cars . You need to take into consideration the time of year- not what you think - our clever friends st the refineries produce a different diesel for winter to that of summer.
The composition of the winter fuel is designed to provide more reliable starting & initial running during low temperatures, this sacrifices a bit of MPG , My typical summer mileage for a 2.2 diesel is 41-42, during the winter this drops to sub 40, another contributary factor is the longer warm up times. I imagine all the manufacturers figures omit the warm up cycle.
