Thanks for the info. I am getting my GPS today, so I will see how accurate my speedo is. Again, Thanks for the info.

 

There was a thread a long time ago where someone posted instructions on how to realign the speedometer needle back to zero. Apparently, a lot of cars have the needle set too high

 

If I put the cruise on and reset the Average MPH counter, it reads about 2 mph slower than the speedo, and is backed up by the GPS. But the radar speed signs are right on the money. By the way, GPS is only good to like 40 feet. They can improve the the accuracy with techniques like differential GPS, but I don't think it's going to be all that accurate on anything but the most expensive models like what the car mags use.