There must be an easier way than all this math.
I just did a 400 mile round trip and with my programmer in the canned towing mode. I was 2 MPH off from my GPS. So I decided to try all this math and change the tire size. I have 275/70/18 tires....I came up with 2646. Well that didn't work....Now my Speedo and programmer are 4-5 MPH off from the GPS.
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2006 F150 4x4 Lariat 5.4L Screw
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