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Discussion Starter #1
I have stock tires my SD. However, I have 3 separate GPS readings that confirm that the speedo is about 3 mph over on the dash vs. the GPS. What is the correction?
 

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Your h&s tuner can recalibrate it for you , or atleast my minimaxx race tuner can
 

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Discussion Starter #3
I'm thinking that perhaps its a tire pressure issue. Although I'm filled with nitrogen, I suspect the extreme temps have affected inflation thus diameter of the tire. Will check back.
 
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