Yeah we are getting there, but we aren't quite there yet, the 300 mile range is rated at 55 miles per hour and that is the S class tesla model, the Roadster gets a little bit less than that, and your milage with electric cars is actually better city compared to hwy.
Honda is coming out with a Electric Fit this year 100ish mile range, 118mpg-e that is not a luxury car like the Tesla's.