Before owning a model X (2016 P90D (20's)) I owned a model S (2014) and found that on longer trips I was easily able to achieve the rated range if I didn't go above 75MPH or so. On the model X I am NEVER able to achieve the rated range. At the very best I can achieve 90% but more often I achieve 80% or less. I've used EVtripplanner.com to compare energy usage on actual trips that I took to the theoretical usage and I get the same results. Surely it must be possible to achieve rated under some circumstances. Isn't that the whole point of rated miles vs those theoretical miles that Tesla used to give?