just got back from doing a few runs on a back road
1st ran 100 km/h(62mph) on the speedo...GPS was 93km/h(58mph)
2nd ran 200km/h(125mph) on the speedo ...GPS was 185km/h(115mph)
3rd ran 285km/h(178mph) on the speedo...GPS was 260km/h(162mph)
these numbers are fairly accurate, made sure to check them carefully...the road was short so I will go back out tommorow and try to run her all out.....thanks jody