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Calculating speed and mileage with oversize tires

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Old Mar 12, 2006 | 03:16 PM
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From: Boston, mASS
Calculating speed and mileage with oversize tires

Ive got a 95 ram 2500 with 4.10 ratio and 8800gvwr. the PO installed 265 tires on it. From what Ive read that truck came with 215's with the option of 245 so how can I figure out what my speedo is set up to measure? Im guessing its throwing my fuel mileage off and Id like to find out what its really making.
Are there any recalibration kits out there?
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