Thanks for the comments, gentlemen. I like playing around with the figures. The Tesla has all sorts of numbers and graphs which are very useful on long journeys. With previous updates received the car will take into account weather conditions as well as topography in estimating the range to empty. PonyRider, the economy of the HQ will be good to work out. I have little idea of what to expect from it especially as the motor is lightly modified. This afternoon I was behind a Tesla Model S. They look good for a car first released ten years ago. What is still quite amazing is that a new company, after barely dipping a toe in the water with the first generation Roadster, made such a successful, ground breaking and accomplished car in their first attempt at producing a sedan.