I have the 37" Goodyear MTR tires and my truck averages 11.0 MPG according to the computer. The reality is about 6% off from that, so it's really about 11.7 MPG. That's better than what I got with the stock tires.
About the speedometer error... The 37" tires make the speedo read closer to knots, but I figure that's apropoos!
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