This might sound unlike the norm, but I am not fussed with power, but I am envying the people getting 600miles from a tank of fuel (albet a CDTi...)
I have a '99 2.0litre 16v CD-Di Estate, and I am getting on average 65-70mpg, but I want more.
I regualrly service it (its due infact), I have a moosive K&N cone filter (see piccy) and well, I want more MPG. I mainly tootle along the motorways at legal speeds, but I also like to chuck it about the A-Roads
Any tips, ECU thing, or owt I can do to get more?