|
It's a proven fact that my Speedo is off as you approach ~80 MPH. I've tested with two GPSs and the GPSs are synched as the Speedo shows anywhere from 1-5 MPH off (depending on speed).
If your GPS speed is ever off, you've got some problems with that reciever of yours. I'd trust the GPS reciever more than the car's speedo.
|