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Octane Rating. I could get into the stoichiometry and how they rate it and what not, but the short answer is that a higher rated octane fuel burns for slightly longer than the lesser rated gasolines. This can help reduce or eliminate knock while improving engine performance.

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Q: What is the difference between unleaded and unleaded plus?
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What is the difference between extra unleaded and xcs plus?

The extra unleaded is cheaper.


What is the difference between unleaded and unleaded plus at Casey's?

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Yes.


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Because it has ethanol in it.


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Yes. The difference in their names merely reflects a difference in ad campaigns.


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