Tesla has shown repeatedly that the map is just a rough approximation of a plan; some have even suggested an exercise in throwing darts. :wink: In reality, for easy, unconcerned travel by 60's and very quick charges for 85's, the Superchargers need to be placed every 100 to 130 miles on flat ground; closer with elevation changes. In many areas, this is what Tesla is doing. There are a few exceptions, but over time, I am sure that Tesla will be filling them in.
If Tesla continues with its success, I firmly believe that in the future, they will be working on in-fill of Superchargers. Having more, closely-spaced chargers, offers owners more choices, increases total capacity, and adds geographic reliability to the system.