Today it was pretty hot, around 30 degrees C, so I decided to leave the soft top on and just use the air con today. Anyway, I set off driving with a full standard charge (190 ideal miles) and reset the trip counter as I normally do. Anyway, after driving for awhile, I noticed that my ideal miles was all the way down to 150, and I had averaged 458 Wh/mi for the first 20 miles of my trip! It was a bit shocking to see that as I have never done anything close to that badly before. At that rate the car would use up a whole standard charge in less that 100 miles (not counting the reserve of course). Anyway, I turned the air con off, opened the windows, reset the trip counter, and for the next few miles of my trip I was able to average a much more normal 225 Wh/mi. I was in stop and go traffic and did spend probably an hour or so in the car, so maybe an hour of using the air con is what did it. The PEM, motor, and battery were all in the blue range so no problem there. Question is, should the AC really be using that much power, and do I need to have Tesla take a look at it?