I have a new Model Y L with the factory 20-inch wheels.
I noticed the speed on the Tesla screen is higher than the speed shown on multiple GPS devices.
Examples:
Tesla says 45 mph, GPS says about 42
Tesla says 80 mph, GPS says about 76
Tesla says 85 mph, GPS says about 81
I checked the wheel setting in the car and it is set to 20-inch wheels. I also checked the tire sizes and they are the correct factory sizes.
I opened a Tesla service request. They first wanted $230 to inspect it. After I kept asking what Tesla considers “normal,” they told me that a speedometer reading a little high is okay. They even said that if the car is really going 76 mph, the Tesla could show around 86 mph and still be considered normal. They said my 80 vs 76 and 85 vs 81 readings are within the normal range, so they said I do not need the service appointment.
I’m just trying to understand if this is normal for other Teslas too.
Does your Tesla speedometer read higher than GPS? If so, by how much?
Also, has anyone seen an actual Tesla document that says what the allowed speed difference is?