I think 320 is a realistic number, but it will only be the case under specific cases, like an ice. City driving uses more energy, just like an ICE, so your range will be lower. In the city, I typically average between 280-320 WH/mile, so 320 miles range isn't going to happen there, and I don't care. I charge the car to 60% every day and only drive about 20-30 miles a day tops. On the freeway, I get between 220 - 260 wh/ mile, depending on the terrain. Plenty of range under those conditions. I typically don't break the law when I drive, so at <= 70m/hr the efficiency is OK when the terrain is relatively flat. In general, I have found the amount of attention being given to range on this forum to be annoying. Change the indicator to % charge and forget about it unless you are road tripping. The range on that trip meter is, at best, a rough estimate that depends on specific assumptions. Overall the range of the car is comparable to an ICE care, except it is a bit more temperature sensitive. Know that and enjoy the car. The only caveat is that, since superchargers aren't every ten feet like gas stations, you have to plan your stops more carefully. Other than that, its just another car (albeit the most technologically advanced, fun-to-drive and cool car that you can buy).