What could be causing my Audi A1 to experience poor fuel efficiency?

I've noticed that my Audi A1's fuel economy has been declining lately. I regularly maintain my car and drive with a light foot, so I'm not sure what could be causing this issue.

There are a few potential reasons for decreased fuel efficiency in your Audi A1. First, check your tire pressure to ensure they are properly inflated. Under-inflated tires can increase drag and decrease fuel efficiency. Secondly, make sure your air filter is clean and not clogged. A dirty air filter can reduce airflow and impact fuel economy. Lastly, your spark plugs could be worn out and in need of replacement. I recommend checking these areas before seeking further assistance.

I had a similar issue with my Audi A1 and found that a faulty oxygen sensor was to blame. This sensor helps regulate the air-fuel mixture in your engine and if it's not working properly, it can lead to decreased fuel economy. I suggest taking your car to a certified mechanic and having them run a diagnostic test to check for any error codes related to the oxygen sensor.

My Audi A1 had poor fuel efficiency due to a dirty fuel injector. Over time, deposits can build up and affect the proper spray pattern of the fuel, leading to decreased fuel economy. I recommend using a fuel injector cleaner additive or having a professional service your fuel injectors to help improve efficiency.