How can I improve the fuel efficiency of my Audi 80 engine?

I recently purchased a used Audi 80 and I've noticed that my fuel efficiency isn't as good as I expected. I want to make sure I'm getting the most out of my car and also save money on gas. What are some steps I can take to improve the fuel efficiency of my Audi 80 engine?

First, make sure your tires are properly inflated. Under-inflated tires can decrease fuel efficiency. It's a good idea to check your tire pressure regularly and keep them inflated to the recommended levels. Also, make sure your engine oil is changed regularly and use the recommended type for your Audi 80 to keep your engine running smoothly.

Consider using a fuel additive to help clean your engine and improve overall performance. Also, try to avoid aggressive driving habits such as rapid acceleration and braking, as these can significantly decrease fuel efficiency.