How To Increase Fuel Efficiency in a Volkswagen Passat?

I recently bought a Volkswagen Passat and noticed that the fuel efficiency is not as good as I expected. What are some tips to improve fuel efficiency in my car?

Regularly check and replace your air filter. A dirty air filter can decrease fuel efficiency.

Use cruise control on the highway to maintain a consistent speed and save gas.

Avoid excessive idling. Turn off your engine if you know you will be stopped for more than 30 seconds.