I don’t know exactly what is changed with the ford performance tune, but regardless the knock sensors will protect the engine the same ways they would without the tune. Just because 87 isn’t recommended doesn’t mean you can’t run it.Interesting. The FP ProCal webpages state "* Premium fuel required*" (sic), so that doesn't seem to disagree. I know I've seen multiple people referring to the computer compensating even with the tune, and I haven't seen any threads about knocking. I know I ran 87 once by accident on a full tank and just seemed to lose some power.
@Ducati1098 You have any insight here?
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