The way it is driven will very much affect range. What kills it the most, as can be seen by the low highway range, is wind resistance. Bikes (especially with upright riders) aren't very aerodynamic to begin with, the Zero probably less so. Wind resistance goes up to the square of the speed. So the 67 or 112 mile highway range is quite believable. At much lower speeds, it will fare much better. Braking is always a net loss, even with regeneration (but without it, that would have destroyed the city range).
Would be neat if they had a sport touring-ish version- better fairings & storage, direct drive, large adjustable screen, more do-dads. Oh, and at least twice the upper model range. Who knows, at that point I might be in the market (if it were affordable). Would be odd not having a clutch or shifter, though. Might take away some of the fun. Could be a reasonable trade for the smoothness, quietness, loss of weight/complexity, and extremely low maintenance.