Hopefully i can help..
What engine size do you have exactly?
Any warning lights on as such since this problem occurred?
1.6 TDi, new to me, just got it a few days ago, 2012 model, only 12000 miles on clock. No warning lights. Thought i'd get at least 55/60 mpg at 60 mph.
Hi..there thanks for your responce..
Ok .yes there are quite a few known issues in regards ***** ***** on these and its generally during the run in period and improves.The air filter on that should be as you look into the engine bay on the right hand side front..if you follow the intake tube between the engine cover and the battery back you come to the air filter box -the box will have about 3 moulded strips on it and a symbol on with a block of 8 circles and two arrows passing through it..that the air filter housing.its held with a series of screws holding the lid down to the main filter box you need to undo these to access the filter itself... However being a diesel at that mileage is certainly way surprising quite low for that age too to be honest..that would be considered in the surrounding stages of breaking in period from new which diesels are generally 'tight' to begin with, and this affects MPG quite alot... usually after the first or second oil change service will you see these improvements and engine breaks in properly..obviously the minor things like driving style/tyre pressures/excess weight can all account for bad mpg..I do hope this helps..if you need to ask anything else or include anything further then please continue before you rate