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My site has quite a bit of info relating to this

http://www.maintainyourcar.com/

It depends on what car gives better fuel economy. Some cars that were designed to run on higher octane will give you better performance when using the correct fuel and your fuel economy.

Check with your manufacturer.

With a Mercury Cougar You could try 91 octane or 95 octane, at least 91 octane will give you a bit better economy

Consider servicing the car too that can help!

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16y ago

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