2014 FLHTCU 6000 miles. I'm a retired police officer and was cruising down the road just enjoying my life. The new bike is running like a champ and the day is just beautiful. When suddenly up ahead, coming at me is a cop car. A quick check of the speedometer and YIKESSS it says I'm doing 70 mph. Too late to try to slow down....but what's this ? The officer just passes right by. No brake lights. He's not coming. What ?? ?? So, I start to wonder. I have a Garmin GPS from my trade in and I installed it on the ElectraGlide. At 30 mph we match, but as the speed increases there is a difference between GPS and Bike. Bike says 60 GPS reads steady 54 Bike reads 65 GPS 61, Bike 70 GPS 65. The faster I go the greater the difference. So, I go find my cop buddy and ask him to verify with the radar. The GPS is right. The Bike is off. Any suggestions ? Anyone else ever check their bike ? I now go by the Garmin.