Um, yeah. I'd suggest between New York and Chicago, y'know? Right now the Supercharger network seems to exist mostly for Californians, and for those crazy people driving between Washington and Boston (a congested route where most sensible people take the train).
Tesla has made a major, major error in its Supercharger location choices, which I have *already* pointed out to them. They are locating the Superchargers near large concentrations of Tesla owners. (Explicit statement from a Tesla representative.) This is wrong. They need to locate them in a string stretching AWAY from large concentrations of Tesla owners. Where there are large concentrations of Tesla owners, it's already easy to charge. But it's hard to drive away from that area. Superchargers need to be located in the smaller cities between large cities, to make road trips possible.
As planned, the Supercharger network -- the long-term plan !!! is useless for driving west from upstate NY. The planned gap on I-90 from Cleveland to Albany (!!!), impossible to drive due to lack of charging, shows that Tesla isn't thinking clearly about this. At least one is planned in Scranton, which is the first one which will be of any use to me. It's not just me, though: the announced "long term plan" has over-large gaps across the Appalachains all the way down, and with the gaps in upstate NY and Canada, Tesla has somehow designed a network which doesn't get you from the East Coast to Chicago. This is just *poor planning*, presumably due to not thinking about when people will actually use Superchargers.
I hope the big Supercharger announcement is "Hey, guys, we've actually designed a Supercharger deployment plan which makes sense!"