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speedometer calibration

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Old 03-18-2014, 08:22 AM
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speedometer calibration

Has anyone ran a GPS speedometer while driving? I don't know what Ford's standards are, however my speedometer is about 2 MPH off. (in Ford's favor.) I have a 2013 6.2, supercab, longbed, 2wd, w/ 3.73. At all ranges, the speedometer shows that I am actually going 2 MPH faster than the GPS says. I ran it against the GPS in my Magellan, and in an app on my phone. Both the Magellan and the phone app were spot on (running at the same time.)
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Old 03-18-2014, 09:22 AM
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Yep, mine reads high also and when I made a comment about that in my "first impressions" post after I took delivery a few folks chimed in with similar experiences. My truck is 4X4 with the 4.30 gears. I figure that eventually I'll put a slightly larger diameter tire on and it'll balance out.

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Old 03-18-2014, 03:42 PM
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Old 03-18-2014, 06:30 PM
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same here 2 mph off. read 67 ...GPS says 65 etc.
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Old 03-18-2014, 08:43 PM
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2mph....same here.
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Old 03-18-2014, 08:57 PM
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My GPS was 2 MPH faster than my Speedometer when I had my 265/70/17s on the truck. When 275/70/18s were installed, the Speedo was right on with the GPS speed viewer. Go figure.
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