Cleveland, MS. Own small farm near Booneville, MS | On the interstate use the stop watch feature on your phone. Set your cruise control at whatever speed and time how long it takes to go 10 miles. I use 10 miles because it makes the math easier. When you know how long it takes to go the 10 miles at x speed you can do the math to determine how accurate your speedometer is. IIRC 70 mph is a football field every 3 seconds. By doing multiple miles you get a more accurate measurement. |
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