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How to diagnose and fix poor fuel economy in an Audi 80?

I have noticed a decrease in fuel efficiency in my Audi 80. What could be causing this issue and how can I improve it?

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J

Check your air filter and replace it if it is dirty. A dirty air filter can restrict airflow to the engine and decrease fuel efficiency.

M

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

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