Looking at Tesla's plans for additional Superchargers, it appears that a number of them will be in metropolitan areas. Not particularly close to major highways. It's entirely possible that these are actually intended to provide local charging. Local Supercharging should be of particular interest to M3 owners who don't have access to home, apartment or work charging. I may be wrong, but I don't recall that the M3 will necessarily include any free juice from Superchargers. It's also possible that Tesla could decide to increase the charge cost to generate some real profits. Think about it: What would it take for local Superchargers to be competitive with current commercial charging stations? Price, time, location, access, resources... Tesla could actually make some money on these.