Compression Ignition Addict
Join Date: Feb 2007
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In order to get the correct revs per mile, you can look up the brand of tires, model and size on the manufactures website and it will tell you what the revs per mile is.
just so you know, setting the revs per mile correctly will not change the odometer either. You will need to add something such as a speed wizard if you are trying to correct the speedo and odometer. Since the tires are only 35's ford can recalibrate the speedo very close to 35" tires.
There are other methods of figuring MPG. You need to figure out how many mile your speedo is off, typically this can be done on an interstate going from mile marker to mile marker, looking at what your ODO shows vs. what the mile markers tell you.
First Coast Diesel Performance
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