How can the Audi A4's fuel efficiency be improved?

I recently got an Audi A4 and while I love the car, I feel that the fuel efficiency could be better. What are some ways to improve the fuel efficiency?

One way to improve fuel efficiency is to regularly check and replace your air filter. A dirty air filter can decrease fuel economy by up to 10%. Also, make sure your tires are properly inflated as under-inflated tires can decrease fuel efficiency.

Another factor that contributes to fuel efficiency is your driving habits. Accelerating and braking aggressively can waste fuel. Try to maintain a consistent speed and avoid unnecessary acceleration and braking.