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The manual and the filler door are the same.
In many places 91 is the highest and many people are using it without issues. You may see a reduction in performance with 91, but it would be hard to test and statistically prove a performance difference with 93 over 91 for the consumer. If cost was an issue I would spend the extra for the 94 during the hot summer months and 91 or above the other 9 months when it's cooler out and less chance of knocking.
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