while on i-5 this weekend, i did a couple checks of the accuracy of my speedometer and odometer... interestingly, they were off by different amounts. the speedo is 5% fast, but the odometer is only 3% "fast." i checked several times, with the same results each time. how can they be different? in other words, if you had the speedo at exactly 60, then drove for 10 minutes, the odometer would read slightly less than 10 miles... anyone else noticed this?