Why am I experiencing poor fuel efficiency in my Audi A6?

I recently purchased a 2019 Audi A6 and have been noticing that I am not getting the advertised fuel efficiency. What could be causing this issue?

The first thing to check is your tire pressure. Underinflated tires can greatly affect your fuel efficiency.

Make sure to keep up with regular maintenance, such as oil changes and air filter replacements. This can also have an impact on your fuel economy.

Another possibility is that you may have a faulty oxygen sensor. This can cause your car to burn more fuel than necessary.