A3 2.0 diesel 2004 .high fuel consumption

[automoto]

whats best to clean it out with?

[johnjohn]

a bit of brake clean of an artist brush should do the job

[automoto]

just disappointed because i got rid of my rover 200 as i was doing 25 mpg and bought this Audi diesel and it only doing 29 mpg
maddening

[automoto]

new maf fitted no difference  bosch

there is a big leak on the pipe which connects to the IMF
can anyone tell me if there supposed to be a o ring there
will this make such a big difference

[sb126]

Where did the new MAF come from.

[TopGun]

there is a big leak on the pipe which connects to the IMF

I had no idea that the International Monetary Fund had a big pipe connected to it! As I personally have never heard of an automotive TLA that equates to IMF then I am guessing that you are in some way referring to the intake air pipe/trunking.

Any air leaking into this part of the intake system is "unmetered" and therefore not seen by the AFM and subsequently is not included in the PCM's fuelling calculations

will this make such a big difference

Yes!  (Specially for Rob.)  

[sb126]

I was  guessing at InletManiFold

[automoto]

sorry Motor Intake Manifold Flap
to be more accurate

[automoto]

new o ring fitted       then 2 gallons  put in total 56 miles 28 mpg looks like ill have to put up with it
only thing worried about it wont pass smoke test on mot 

[Crasher]

That not right, are you basing the MPG on the daft dash display or proproer brim to brim calc?