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Adjusting Speedometer / Odometer

muttonbuster

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Has anyone adjusted the speedometer or odometer to be more accurate for their tires? It sounds like its something you can do with forscan with some revs or rotations per mile setting? I would like to adjust my speedometer to be right on instead of 3% low, and hopefully once I do that the mpg calculator in the truck will be 3% closer to the right number as well.
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bgn

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Clubs
 
Max you can do with Forscan is 235/65R17.

The computer is likely off by at least that much, so you're likely getting real mileage anyway.
 

Old Man

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There's an engineering screen in the truck that allows for the reported mpg display since it is set optimistically to make people feel better.
 

StillWaiting

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I wish. Never took that into consideration when I put my larger tires on. Still worth it though
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