With ICE vehicles there is always a tradeoff with the performance versions of vehicles versus the standard (e.g. gas mileage, gearing comfort, ride stiffness). With the Model S having a variable air suspension, single speed transmission, and the same motor - are there any downsides? Does having beefier power components help or hurt efficiency? Is regen any different on the performance versus non-performance model? Just wondering if the only downside is cost now that they will allow all interior options on the performance models.