4motion MPG

[trev124]

Hello all. Anyone got any idea of the true MPG on a PD130 4motion estate. My wifes car is averaging less than 40mpg on a 38mile round trip and thats driving easy although with only limited opportunity to use 6th gear. I managed 42mpg with another airflow meter driving mostly in 6th. The car starts, idles smoothly and drives fine although initially I thought there was a slight roughness when driving at a steady 50ish, like one cylinder was getting a different quantity of fuel. Perhaps it my imagination but I don't notice it now. Any help appreciated. Trevor