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Economy is not a concern for me but fuel prices kinda are since it limits my fun. Funny that so many people are concerned about mileage that it's typically their second question when asking about my truck after they ask what it is or why I have it.

Like 98G is saying, the error is a percentage so the higher your speed, the higher the error. I also converted from 11.00s to 16.00s on my M813 so i made this quick crossover reference as a short term fix till I get the speedo gear updated. Check out this thread for info on updating the...

I made a chart based on math and then drove by the sheriff's radar trailer and the speed readout matched what the math said.

A 2" drop in less then 10 miles is way excessive. With the overdrive effect of the 53s, the cruising mileage should be about 8-10 mpg according to others who have swapped to 53s. If the speedo cable gear box on the transfer case is still the factory ratio for 11.00-20s then you're actually...