This range is not really surprising. Musk has previously stated that the performance limitation on the Model S has always been the battery. So the bigger the ba

This range is not really surprising. Musk has previously stated that the performance limitation on the Model S has always been the battery. So the bigger the battery, the more juice you can pull for crazy launches. The 620 mile range is just a side-effect of putting in a bigger battery so it can hit the acceleration and top-speed numbers needed to put it in the super-car big-leagues.