what is the ideal Wh/Mile to match expected range left with actual range? i find that around 275 is an ideal range...of course lower the better...

the only time I am concerned about energy consumption is on long hops while on a road trip. for "normal" daily driving it shouldn't be an issue. I drive and enjoy the performance of the car regardless of the consumption. to answer your question, keeping a steady speed helps keeping the numbers down, I average around 280-310

188 wh/km or 300 wh/mile will give you exactly the "rated" range in a P85D (and probably a P90D). I don't know the numbers for "ideal".

i guess what im saying is that when my vehicle says on the screen that i have 200 miles left, when i run at 300 wh/mile, i really end up with around 175 miles when all is said and done. when i run at 250wh/mile, i find im much closer to that 200 mile range.

Why not set the car to display %energy rather than distance, and call it a day? If precise range estimate is important, you are probably better off using the energy display. IMO it is much more useful to know my tank is 25% full, rather than a guess at a distance using a somewhat dubious calculation.

That's an option, but then you still need to do the math to convert to Projected range. Why doesn't Tesla just create a third display option so it's Rated Range, Energy (i.e., percentage) and Projected Range? They give us projected range anyway on the Consumption tab. Why not let us see it on the Instrument cluster? I can imagine at some point they did it for "range anxiety" marketing purposes, but the range is way up now and customers are buying the model/range they want. Give us the facts which reflect our driving conditions and style.

I just did the math on this to understand it for myself. I charged my S90D to 90%, then drove the car about 10 miles, parked for an hour and a half, drove home 10 miles, and then did the math. The point is that these numbers have minimal vampire loss. Here's the math: 100% RR = 292 90% RR = 264 After driving 20 miles: RR = 242 Battery percentage = 82% Consumption last 15mi = 300 Wh/mi Projected range = 232 Projected range / Rated range = 232 / 242 = 95.9% Wh/mi to achieve Rate Range = 300 x .959 = 288 Wh/mi Implied battery capacity = 288 Wh/mi * 292 Rated Range = 84 kWh Implied "reserve" or "anti-brick" = 6 kWh In practice, I consume about 310Wh/mi so my 100% range is about 84,000 / 310 = 270 miles YMMV!

For the 70D, the EPA rated range corresponds to 290 wH/mi. But that assumes all 70 KWH are available for driving, which is unlikely to be true.

I have noted 3 Ranges in various places in my Model X. 1 - Rated Range; 2 - Ideal Range and 3 - Projected range Which is the most important in terms of remaining range to drive? What is the difference between Ideal and Rated? Is the Projected range calculated by the wh/mile and adjusted as watts/mile history changes? Going on a Road Trip in a couple of weeks and need to know which to pay most attention to.