If you start at the Miami (labeled on the map) and place Supercharger stations spaced roughly 170-200 miles away on major highways you get what you see on the map. I believe we've already agreed that the so-called Port Charlotte location isn't ideally placed for either of us. So in summary, if the state is eventually saturated with Supercharger locations it shouldn't matter where you live. However, for the initial roll out of just a handful of stations, it will definately matter where the starting point was located to pace off those initial locations. My guess is that for these initial locations rather than placing them between major cities, they started at a major city (Miami), they paced off a little less than 200 miles, and found the nearest city and placed them there.