How do I improve my Volkswagen Passat's fuel efficiency?

I have noticed that my Volkswagen Passat's fuel efficiency has been decreasing lately. What are some tips and tricks to help improve my car's fuel efficiency?

One simple way to improve fuel efficiency is to properly inflate your tires. Under-inflated tires can decrease fuel efficiency by up to 3%. Make sure to check them regularly.

Another tip is to avoid idling for too long. If you are stopped for more than 30 seconds, turn off your engine. This can help save fuel in the long run.

You can also improve fuel efficiency by avoiding unnecessary weight in your car. Get rid of any unnecessary items in your trunk or backseat to help save fuel.

Regular maintenance is also key to maintaining good fuel efficiency. Make sure to get your car checked and serviced regularly to keep it running at its best.