How can I increase fuel efficiency in my Audi 80?

I have been noticing that my Audi 80 is not getting the best gas mileage. This is causing me to spend more on fuel. What steps can I take to improve the fuel efficiency of my car?

Regularly check and replace the air filter in your car. A dirty air filter can reduce your car's fuel efficiency.

Avoid aggressive driving and try to maintain a constant speed while driving. Sudden starts and stops can use up more fuel.

Make sure your tires are properly inflated. Under-inflated tires can decrease fuel efficiency.