In a similar situation and it sounds like a lot of people are experiencing the same issue. I am nearing the end of my lease on a lightly driven i3 Rex (11000 miles over a 30 month term (our commute is very short)). I live in Berkeley so it's never seen any conditions except dry, paved roads, and we had a newborn in that time period so we weren't exactly ripping around at max speed. The tires are all apparently worn down to the tread. The major issue I tried to bring up is that we experienced a flat, which was replaced by Weatherford BMW with OEM tires, LESS THAN 1,200 miles ago, and that tire has worn completely....there is clearly something wrong with the tires. BMW and Weatherford are denying any issues with the tires so they are making me eat the cost of the replacements for lease return. the maintenance on this car, if one were to purchase it, would be a nightmare. Cross shopping a bolt but may go with a used leaf to just get a good deal.