I picked up a second hand 1.6TDI A3 Sportback, 59 plate, one of the main reasons for choosing this model was the attractive MPG that I was supposed to get with the car! I travelled over 100 miles with mainly motorway but a varied journey. I only got 48 MPG for an average of the journey, I was expecting at least 55 ish!!!! Is this normal for the engine? Any advice would be appreciated!