How can I improve the fuel efficiency in my Audi A4?

I've noticed that my Audi A4 seems to be burning through gas faster than usual. Is there anything I can do to improve the fuel efficiency?

One simple way to improve fuel efficiency is to make sure your tires are properly inflated. Underinflated tires can cause your car to use more gas.

Another tip is to avoid idling for extended periods of time. If you know you'll be sitting in your car for a while, consider turning it off instead of leaving it running.