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Odometer vs Mapquest

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Mr Comet
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Odometer vs Mapquest

Post #1 by Mr Comet » Mon Aug 10, 2015 2:02 pm

I took a road trip this weekend and found that my odometer reading is off from what mapquest shows the distance as. my odometer read an approximately 110 mile trip as 107.4 miles and mapquest shows the distance as 113.3 miles. Difference of 5.9 miles. I have a T5 transmission. Can I get closer with a different driven gear?

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Re: Odometer vs Mapquest

Post #2 by ludwig » Mon Aug 10, 2015 2:27 pm

Tire size will affect the measured distance on the odo. Plus, you have a few added items, like pulling into parking/pit stop and so forth.

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Re: Odometer vs Mapquest

Post #3 by rocklord » Mon Aug 10, 2015 3:02 pm

I wouldn't compare my odometer reading with what a website said it should be.

When I want to check the accuracy of my speedometer, I use my Garmin.
If your speedometer/odometer mechanicals are functioning correctly, this will tell if it's off.

Some new aftermarket speedometers use GPS instead of a mechanical connection for speed and distance
doing away with the accuracy problems.

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Re: Odometer vs Mapquest

Post #4 by aribert » Thu Sep 17, 2015 7:34 am

I'm a bit late in chiming in - I use both freeway mile markers (min of a 10 mile stretch) and a speedo app on my phone. The greater the distance traveled the more accurate your odometer calibration can/will be. I would not be using MapQuest or similar for mileage.

Ford speedo gears come in approx. 4% error correction for each change in speedo gear tooth count. I was able to dial my Falcon with (now) 15 inch tires and 3.0 diff in to within less than 1% speedo error by changing out the speedo gear. On my 91 F150, with the 2.7x diff and slightly larger dia tires, I have the smallest tooth count (16) speedo gear and still about 3 to 4% error - a 15 tooth speedo gear would be ideal if available. My 61 and 91 share the exact same style of speedo gears. I **think** the T5 uses a different style of speedo gear.
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