How do I maintain the fuel efficiency of my Volkswagen Passat?

I have had my Passat for a few years now and I've noticed that the fuel efficiency has decreased. What can I do to improve it?

Regular maintenance is crucial for maintaining the fuel efficiency of your Passat. Make sure to get your oil changed, air filter replaced, and tune-up every 5,000 miles.

Keep an eye on your tire pressure, as under-inflated tires can decrease your fuel efficiency. Make sure to check your tires every month and refill them to the recommended pressure.

Avoid aggressive driving and excessive idling, as these can greatly impact your fuel efficiency. Accelerate and brake smoothly and turn off your engine if you will be stopped for more than a minute.