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What is the recommended minimum octane rating for a 1990 Audi 80?

I just bought a 1990 Audi 80 and am unsure of the correct octane rating to use for optimal engine performance. My local gas station offers regular (87), mid-grade (89), and premium (91) options. I want to make sure I'm using the right fuel for my car. Could someone please advise?

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The recommended minimum octane rating for a 1990 Audi 80 is 91.

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