That's what fucks me up here! XD
Tesla is probably the most closely watched auto manufacturer on earth. And it's mostly fans! So like, friendly faces doing hypermileage content or commenting to other friendly fans about their fuel savings...
The video I linked is literally a Tesla fan being like "oh wait, it skipped a mile, what the fuck, did it always do that?"
Yeah, I think smart/honest engineers do it exactly like that.
The GPS validates the physical rotation data, corrects for errors. That's why the standard of accuracy has improved in the last 10 years.