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As rolling resistance data is closely guarded, one default you can assume is that the OEM rubber is the lowest RR you are likely to find. This is data the OEM has to submit to the EPA to get an MPG rating and as MPG ratings are often sales points, the OEM has a reason to use the lowest RR tires possible.
Keep the skinny tires.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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