When I checked the tire size in the custom options menu after I received my Gryphon with the custom tunes, it also didn't show the # that I had given Bill. If I left it alone, the speed was off by 2-3mph. If I changed it to the # that I used when I first purchased the Edge (2640), it's spot on with what my GPS shows.
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2008 F150 Supercrew Lariat 4x4
5.4L - 4.88 Gears
PHP Gryphon Programmer - BDS 6" Lift - Magnaflow Dual Exhaust - JLT Ram Air Intake - 20" Pacer Ridgeline Rims with 35" Mickey Thompson Baja ATZs Tires - Westin BullBar with Driving Lights
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