The Golf TDI PD130 is a brilliant car and today I've achieved the best MPG since I've owned the car. The long term average for MPG over the last 4 months and over 2000 miles is 52mpg but on a long drive today I managed to get over 62MPG from the car. It appears that the slightly warmer temperatures are helping the fuel economy as the same journey generally has achieved a maximum of around 55MPG over the last few months.
So if you are thinking of changing to a new car "to save money" then think again! An old car doesn't necessarily mean you're paying more for fuel and a new car is guaranteed to lose masses more in depreciation!