Oops I did it again
Before you lot start ridiculing me again - it was not intentional.
Got the warning - 35 miles remaining. My journey was 30 miles. However, I had a message to do close to the petrol station and got delayed. So by the time I arrived the place had shut - 5 miles remaining. The next station was shut too. Car now reading 0 miles remaining. Drove 2 miles to a station I knew would be open. Filled the car to the brim. This time the tank took 53.44L.
This time I noticed that Active Info Display, digital fuel gauge, red warning area has 3 segments. The car was showing 0 miles remaining with 1 segment left. I didn't think that VW would have a car without an extra fuel reserve. That red segment has to be the extra fuel reserve.
I'm beginning to think my GTI actually has a 55L fuel tank.
Oh, and the odometer said 411 miles this time. So my fuel economy was 35mpg.