The lead plaintiff in the case, Nyree Hinton, bought a used Model Y with less than 37,000 miles (59,546 km) on the odometer. Within six months, it had pushed past the 50,000-mile (80,467 km) mark, at which point the car’s bumper-to-bumper warranty expired. (Like virtually all EVs, Tesla powertrains have a separate warranty that lasts much longer.)
For this six-month period, Hinton says his Model Y odometer gained 13,228 miles (21,288 km). By comparison, averages of his three previous vehicles showed that with the same commute, he was only driving 6,086 miles (9,794 km) per 6 months.
Edit: I just want to point out that I just learned that changing your tires to ones of a different diameter can also affect how your spedometer clocks. So yeah, this issue is full of nuance and plausible things as to why this could not be true.
The dash cam would work. I wouldn’t trust obd because they could be sending the same info through or doing some VW diesel gate stuff. Maybe comparing obd to waze to what’s displayed on screen would be better. When I mount different size tires on my vehicles I use waze to compare the speed on the speedometer vs waze. Most vehicles in the past read faster than it was going, it’s only in the past few years I’ve seen them being more accurate, around when telemetry started being more prevalent.
I tested my car and the speedometer, trip meter and OBD give 3 completely different values. It’s kind of expected because all manufacturers make overreading speedometers.
I think comparing trip meter/odometer, OBD and GPS is the way to go. It would be amusing if Teslas are programmed to behave when something is monitoring it over OBD.