So it may be an app update rather than the car update that's causing this?Yes ... just updated to 4.8 on the app and my slider no longer shows both miles and percentage. Also when I ask Siri what's my car charge it only gives percent whereas it used to say the percentage and "this should be good for x miles" (even when set as percentage on the car screen).
On the bright side we may get less "winter range" threads if Tesla move away from mileage