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Old 05-16-2012
panohodges panohodges is offline
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Join Date: May 2010
Location: Charlotte, North Carolina
Posts: 19
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I had the same issue. Ran about 5-10 MPH slower than speedometershowed. I had the car tuned on dyno and its been dead on with 2 GPS units and a phone app over the last 6 months.

I had gone to 2-3 ford dealerships and was told there was nothing they could do. They all suggested putting it on dyno to recalibrate.
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