When connected to CarPlay the speed on the supposedly gps speed in Waze always shows a 1km/h difference compared to that on the speedometer (at least in my case)
When NOT connected to CarPlay the difference is larger. At 90 km/h on the speedometer the speed in Waze is 85 km/h and at 140 the speed on Waze is 130. (Actual GPS speed)
When connecting to CarPlay a message says that the phone will use selected data from the car and this includes the car’s speed. However, this value is not accurate.
My request is for me to be able to choose whether or not to use car’s data or the data from my phone’s gps. I know this is not exclusive to Waze and is present in every app with some kind of speed value, so it’s not up to you for fixing it, but I’ll take my chance :)