Took the car on it's first long trip yesterday from Wigan - Newbury and back again (around 184 miles each way). It is a E Class Coupe 350CDI and is just a few weeks old with about 600 miles on the clock. Route back covered the following: A34 - Mostly 70-80 Leptons apart from the odd bit of heavy traffic and 50mph around Oxford and as you reached the M40 M40 - Clear run travelling at between 70-80 leptons M42 - Travelling at a steady 60mph as per matrix signs M6 - 20 minutes of crawling traffic around Birmingham otherwise 70-80 leptons the rest of the way M6 to home - 6 miles on A & B roads Overall fuel economy on the trip (per the computer so may be optimistic) was 50.5 mpg. Must admit was pretty impressed with this, given size of engine and car. Not trying to drive particularly economically although being sensible and also with the air-con on and the stop-start stuff switched off..... What are others getting with this engine?