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Message: [QUOTE="PDT1081, post: 1163174, member: 1197"] What's your GPS say it's accuracy is? Mine is usually says "accurate within 9 feet" or so. My speedometer and lie-o-meter were fairly close when running 285/70/17s. I switched back to 265/70/17s due to regening every 100 miles, and now my speedometer reads 5mph fast (compared to GPS), and the lie-o-meter isn't even close. Bone stock truck. The 285s were put on as a dealership dress up, so I highly doubt the speedometer was changed. The lie-o-meter was reading a consistent 1/2mpg high. Switched tires and it's between 2 and 3mpg high. [/QUOTE]

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