I did a 240 mile drive today in really cold weather (between 10-15 degrees F). I could not believe the consumption, averaging 450 wh/mile on the first leg, then about 420 on the 2nd. I think I had a pretty strong headwind too (which may explain the lower on the 2nd because I turned north at that point). I was using about 1.5 miles for every mile. For the first two legs I did not have range mode on. On the 3rd leg I did, and that dropped consumption to 380, but I was also traveling at a lower speed. The posts have great information and I knew mostly what to expect. For new S and potential owners, when it gets that cold the real world mileage is 150-180 (my car is rated at 270) or about 60%. You might get 75% if you turn down the heat and baby it. The good news is I got normal charge rates at the superchargers. In fact, I think they were the best charge rates I have seen, and I had the car over a hot summer. On the first one I was surprised to hear the battery cooling system come on when I pulled away, even though it was about 10 degrees. It did not stay on long. To those that posted, thanks for all the great information. Still love the car, but it would make me nervous if the superchargers were more than 150 miles apart in a cold climate.