What are the common causes of increased fuel consumption in the Audi A2?

I've noticed a sudden increase in fuel consumption in my Audi A2. What could be the possible reasons and how can I address them?

One common cause of increased fuel consumption in the Audi A2 is a dirty air filter. Make sure to regularly check and replace your air filter to improve fuel efficiency. Additionally, driving at high speeds or in congested traffic can also contribute to increased fuel consumption.