Can my Audi A4 be modified to improve fuel efficiency?

I want to reduce my gas consumption without compromising the performance of my Audi A4. What modifications can I make to improve fuel efficiency?

The easiest and most impactful modification you can make is to switch to low-rolling-resistance tires. This will reduce the amount of energy needed to turn the wheels, resulting in better fuel efficiency. Additionally, you can also consider installing a performance air filter and upgrading your exhaust system to improve airflow, reducing the strain on your engine and increasing fuel efficiency.