We know the M3 should be able to achieve 215 miles -- but I'm assuming the number they give you is under optimal conditions. 1) If you have 3 or 4 people in the car, in cold conditions what can you realistically expect to get? 80% of the advertised mileage? 70%? Less? 2) Also, how much do you lose in a day from idle time? For instance (assuming 215 mile range), if I drive 60 miles to a destination, stay a couple nights without charging, and return home another 60 miles -- will I be cutting it very close on range? 3) while the supercharger network is being built out, are there alternatives to get another 25-50 miles out of your tesla in an emergency situation? a portable charger of some sort maybe? Thanks!