Speedo off with 20's?

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Yukon96

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Joined
Aug 24, 2013
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Location
Florida
I'm currently running slightly larger tires than stock, (265-75-16). At 25 mph the speedo reads about 31 mph. At 45 mph it reads 55 mph. At higher speeds the difference increases even more. Obviously something is seriously off here. What can I do to correct it?
 

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