I have been toying with the idea of pulling the trigger on a new S or X (most likely S) and this is one thing I have wondered about. What kind of mileage do you currently have, if I may ask?
Pulling me in the "go for it" direction are free lifetime supercharging and pending price increases, although I missed the boat on that last one.
Holding me back is the possibility of "improved" Ontario incentives, a possible federal incentive as well as talk of EVs being HST exempt (or at least from the Ontario provincial portion).