| That is actually very common. The navigation is going to be the correct one, because it gets its reading from a satellite. You can have the OBC and the speedometer corrected by a professional; however it may come to be a headache and not worth it.
Since you have a navigation, you are much better off. Just follow that. The problem is know to be an issue right out of the factory; and when different sized wheels are added it only complicated the problem. The nav will always be correct due to the nature of how it measures it.
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