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Premium Member
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10,524 Posts
Have you measured the rolling radius.


The stock speedo is inaccurate for this eventuality anyway
 

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Super Moderator
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7,124 Posts
You had 245/45/17
You should use 245/40/18

The speed error is not handled by the ECU as far as i am aware.

When i plug my ELM327 in and look at the Seed(OBD) live data it is the same as GPS speed.
 
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