If I let my wife drive she can get 35mpg from my disco.
When I drive it is around 24mpg. It has a de-cat pipe,EGR blanked, and chip tunning, and it is auto.
The de-cat was the best thing I did, pipe came from Partco/Brown Brothers for a 2001 TD5 £30 quid.
It is good thing I have a works...