All right, this sounds like you're not going into the load tune state after you've entered the Tire Size (TS), or the your Gear Ratio (GR) value is wrong. BOTH will have "default" (placeholder) values when you first open the custom options menu that may or may not be correct.
I can't hep you with the GR value, you have to get that off the VIN sticker. But I suggest a TS value of 2573mm. Your unloaded tire circumference is about 2653 and reducing it by 3% for the flattening effect of weight gives 2573.
Now, when you open the Custom Options Menu: scroll to GR and put in the correct figure if it's not already there. Hit [Enter] to "save" it. Scroll to TS and put in 2573. Hit [Enter] to save it. If you push the [Menu] button in either case, you will "back out" without saving. Then, scroll to "Done" and hit [Enter] to load your tune and those values into your PCM.
Test your speed after you get the tune loaded. If the Gryphon still says you're going slower than you really are, increase your TS. But, this time (and any future time) you open the Custom Options Menu, scroll to "Load Previous Settings as the very first step you perform!. Hit [Enter] to retrieve your previous TS and GR (and any other changes you made. Now, when you scroll to TS, you should see a value very close to what you last used - it won't be quite the same due to "rounding", but the difference will be minor. You can change it as needed.
If you don't see the proper TS after loading previous settings, or if you skip the "Load Previous Settings", you're doing things wrong. Re-read these instructions.
- Jack
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