If your new tires are 275/70-18s, I'd expect the rev per mile value to be about 628. The 650 figure you stated is what I'd expect to see for your stock 275/65-18s.
But actually, the Gryphon expects you to enter the Tire Size as a circumference in millimeters, and your new TS should be close to 2560mm. If you have a new CS or CTS, you enter the diameter in inches, which would be 32.1" for your new feet.
- 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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