I have a 2018 Edge SEL, new on May 2nd, I am the first owner and took delivery of it with 50 miles on the clock. Absolutely bone stock. Today I had a 300 mile trip and noticed that when I was doing a steady 70 MPH, with cruise on, Waze was telling me I was doing 83 MPH. I did a double take and then stopped, downloaded a GPS information app for my iPhone 8 and 6S and got the same results. Both phones were telling me I was doing 83MPH and the car speedometer was dead on 70 and the cruise said 70MPH. Having worked on GPS at a very intimate level, I am absolutely sure that the GPS derived speed was correct (I had between 7 and 10 satellites in-view so accuracy was pretty high). I am shocked that the speedometer can be this far off on a brand new modern car.... I normally drive 5 over at 70 MPH but 13 over is firmly in ticketing territory!
Any ideas what is going on and how I can get the issue addressed? Has anyone else seen weird issues with their speedometer?