Why does my Audi A5 have reduced fuel efficiency?

I've noticed that my Audi A5 is not getting the same fuel efficiency as when I first purchased it. What could be causing this issue?

The most common cause of reduced fuel efficiency in the Audi A5 is a dirty air filter. Regularly cleaning or replacing the air filter can improve your car's gas mileage.

Another potential cause of reduced fuel efficiency is low tire pressure. Be sure to regularly check and inflate your tires to the recommended levels for optimal gas mileage.

In some cases, a faulty oxygen sensor can affect the fuel efficiency of your car. Have a mechanic check and replace the sensor if necessary.