Why is my Audi A2's fuel efficiency lower than advertised?

I recently purchased a new Audi A2 and noticed that the fuel efficiency is not as good as what was advertised. I followed all the recommended techniques for fuel efficiency, but I still can't seem to get the advertised numbers. What could be causing this and how can I improve my fuel efficiency?

First, make sure you are using the correct fuel grade for your A2. Using a lower grade can decrease your fuel efficiency. Additionally, regularly servicing your car and keeping up with maintenance can greatly improve your fuel efficiency.