Hi all After last weeks saga of having our 2003 A6 written off, we are trialling a replacement 2005 3.0 tdi quattro SE. On the trip home on the motorway we only averaged 34mpg but the manufacturer states we should have had as much as 43mpg. There was only me in the car and minimal fuel so no weight in the car. No faults on dash, although the car does need a service. Any ideas anyone? Thanks in advance!!