Have felt a slight rumble from right rear tire. Had tire re-balanced and it still does it. It behaves just like a thrown balancing weight. Comes on at around 65 mph, and stays up to about 75mph and is speed dependent. Happens on left and right hand curves.. Is this something to do with the electric motor being on the right side(?) rear axle. This is a 2016 with 68k mi. Very annoying,