I must have OCD.
I,ve done an mpg calc for every tankfull in every vehicle ive had !.
In my opinion, its a very good way of keeping a check on how your motor is running. Dodgy sensor readings, failed components, even sticking brakes and under inflated tyres all will affect mpg.
With the D2 the " factory " combined mpg for the manual is 26.6 and LRO gave it " real world " figure of 25.8. ( TD5 ).
My 2002 Td5 is doing 27.8 when towing my 200 TDI disco, and 28.9 when my wife uses it doing 3 to 5 miles at a time.
If I go on the moytorway at 60 mph I get about 34.
I have done the EGR, de-cat, pipercross filter and remap. ( if you dont know what all that means, you will do once you,ve bought one !! ).
( this MPG question gets asked a lot )( it ought to go in the top ten most asked questions together with, Please help, Which tyres, The tree Amigos and Air suspension,s dropped overnight !!. )
Del.