How can I increase the gas mileage of my Audi A5?

I recently purchased an Audi A5 and noticed that the gas mileage is not as good as I expected. Is there anything I can do to improve it?

Regularly check and replace your air filter. This can improve gas mileage by up to 15%.

Maintain proper tire pressure. Under-inflated tires can decrease gas mileage by up to 0.2% for every 1 psi drop in pressure.

Avoid aggressive driving and excessive idling. This can save you up to 35% on gas.