FAQ Category
FAQ Answer
A vehicle's speed and accuracy of the speedometer can be made by measuring the time it takes to travel one mile. The best way to conduct the test is to set cruise at one speed and measure the time it takes to travel between two green mile markers on Interstate or other US/state highway.
Using the seconds on the left on the chart below, the corresponding mph is listed in the right column.
| Seconds | Miles Per Hour |
|---|---|
| 45.5 | 79 |
| 46 | 78 |
| 46.7 | 77 |
| 47 | 76 |
| 48 | 75 |
| 48.5 | 74 |
| 49 | 73 |
| 50 | 72 |
| 50.5 | 71 |
| 51.5 | 70 |
| 52 | 69 |
| 53 | 68 |
| 53.5 | 67 |
| 54.4 | 66 |
| 55 | 65 |
| 56 | 64 |
| 57 | 63 |
| 58 | 62 |
| 59 | 61 |
| 60 | 60 |
| 61 | 59 |
| 62 | 58 |
| 63 | 57 |
| 64 | 56 |
| 65.5 | 55 |
| 66.5 | 54 |
| 68 | 63 |
| 69 | 52 |
(Revised 07-2003)