Yeah I read that too. The Platinum has the 25 extra horsepower, all the turbo 3.5's run on the 91 octane to eek out the horsepower. They'll run on the 89, or 87, but not as well, not like the older 5.4.
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I read and from what I see the crank power ratings are done with 93 octane by ford. The engines are designed to run on 87 octane minimum but will not produce published power output unless on 91 octane gasoline. So there is a difference in power between the two.
I’d hope so, if I payed $80,000 for a Platinum and was told I get more power I’d want more available power.