How do I troubleshoot high fuel consumption in my Audi 80?

I've noticed that my Audi 80 is using more fuel than usual. What could be the possible causes of this issue and how can I fix it?

It could be a problem with your oxygen sensor or your fuel injectors. I would recommend getting those checked and replaced if necessary.

Have you checked your tire pressure? Under-inflated tires can significantly increase fuel consumption. Make sure to check them regularly.