mazz520,
I'd guess you're doing what 90% (just a swag - no facts to support it) of the Gryphon owners are doing. The other 10% are running the 91+ octane custom performance tune ('cause they want the additional acceleration/power).
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"Good judgement comes from experience. Experience comes from bad judgement." - Colin Powell to new batch of 2LTs (while serving as V Corps Commander)
Factory manuals here: http://www.motorcraftservice.com
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