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Go out on the interstate and time yourself between mile markers at some constant speed, 60 is convenient. Divide the time in seconds into 3600.
If it takes you for example 62 seconds to go a mile instead of 60 seconds, your actual average speed over that mile is 58mph.
Jeph's discussion of odo error is why rallies usually have an odo check section, so that the individual car odo is compared with the device (odometer) that measured the rally. Variations of 10 to 20% are not uncommon.
Last edited by Ronzi; 06-07-2007 at 05:54 PM.
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