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I have seen this happen in several f150's 09 and up. IDS shows the programming complete but when you check it nothing has changed. NO IDEA why its doing this either.
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I had mine done. I went from having the stock pirellis on 20"s to Raptor wheels with 315/70/17 tires. Truck ran a little crappy (like bumpy shifts) and so I went in to Ford to have it recalibrated. Huge difference after that. I have an Ecoboost too if that makes a difference...
Don't know. Of course the gauge will be way off. You have to check it by hand,then add 6% more miles cause your odometer will be off too. Haven't done that yet. However, I usually lost about 2mpg with my diesels in the past.
ecoscrew. Please let me know if the calibration "took" Just check it before and after with a hand held gps.