According to an article by Market watch it states that the added energy cost for the charging of the Tesla 3 is about 601.50 a year - cheap compared to gas but a little on the high side depending where you live. It also goes on to say that there is 1st year maintenance issues costing about 475.00 however you are able to forgo the diagnositics and it will not effect your warranty and also it may be cheaper to go on a pre paid maintenance package.
Here is what totally suprised me - The annual maintenance cost for the Model S is about 2800.00
The annual maintenance cost for the Mercedes Benz S class run at about 18000.00 per year and BMW 7 series 17000.00
Holy smokes is this just for luxury or high end models because up until this point all I have read about it there is no or very little maintenance for the EV but 18000.00 would be a huge cost for me annually