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91 is the highest available in many places, most of Cali being one of them. Premium fuel is usually titled 91+ but yes, they used 93 for this testing.So, Ford should clarify, they say "premium" fuel is required however their warranty for the performance packs at one point stated 91 octane minimum. So are the ratings at 91 octane (and I suspect they are because 93 is not available everywhere and since they are not a boutique tuner but rather a global manufacturer...) If 91 octane, that could explain some of the reason for somewhat lower gains than others publish.
Someone said CA can't get 93, just 91, 93 is rare here, 91 is everywhere.
https://performanceparts.ford.com/download/PDFS/fpp-warranty.pdf
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