Right, just to give some real life figures, I've been plotting all my fuel usage in the Fuelly website since day one. Here are my figures after 13 months of ownership. These are calculated from fuel receipts and brim to brim filling, although to be fair my fuel computer is rarely more then 1mpg out (massively more accurate than any previous VW I've ever owned).
Bear in mind, I've only had one long motorway trip in the car, and 80% of my mileage is city commuting with the inevitable crawl and traffic jams. This is not a high mileage motorway muncher car. Mine is also a DSG (thirstier than a manual).
Total Mileage tracked 9,591
Overall MPG - 45.5 mpg
Overall (last 10 fill ups) - 46.8mpg
Best MPG - 55.6mpg
Worst MPG - 45.1mpg
Last fill up (25/10/14) - 47.8mpg