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I don't know what's wrong specifically in your case.
However, I would contribute a couple of points:
1. I presume you have the 1.6TDi; these VAG diesels take a good few miles to bed in and achieve optimum perfromance/economy. I've had two TDi engines, 1.9 and 2.0, and I'd say that they both only loosened up after about 10k miles, maybe longer.
2. Are you measuring your mpg using the driver infromation system? This is really only a guide and you would get a more accurate measurement by doing several 'brim to brim' fills and calculating the mileage between fills. (1 gallon = 4.55 litres).
Maybe ask another dealer to do a diagnostic.
What sort of roads/traffic do you mainly encounter? Could this be a factor ? Where do you buy your fuel?
Hope you get it sorted.
Pat
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