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Power Strokes
2017+ 6.7 Aluminum Super Duty
Mileage drop
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[QUOTE="Floorboard79, post: 1446639"] if you have 17" or 18" wheels the tires are smaller than the 20's. You can re-calibrate the speedo with forscan, once you go past a small amount of correction it trips a DTC. My stock tires were 275-70-18, put 285-75-18's and got it within 1% correct with forscan and no DTC in a few thousand miles. When i went too far it tripped a DTC I think hypertech makes a speedo deal too [/QUOTE]
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