I've noticed Bill seems to use a "squish" value that is less than what I've found works for me. If the unloaded circumference is about 2793mm, I would actually try 2709mm, which corresponds to a 3% reduction due to "squish".
However, anything you try (and your numbers seem reasonable too) is just a starting place. Plug it in and see how close the Gryphon's speed reading is to a GPS or how close it is to driving a measured mile at a constant speed and dividing the time in seconds into 3600. Adjust as necessary to make the Gryphon match the GPS or computed speed. (The dash speedo usually reads about 3% faster than the actual speed, by the way).
- Jack
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2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam
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