tesla rated range calculation

2015 P85D I've got a 140-mile trip to the nearest SC in a couple days and was playing with the navigation system. I set the destination for the SC and the system came back with 4% remaining starting with 87% (or 216 rated miles)... so is the navigation system telling me my efficiency is going...

This is my third video in the series of Scan My Tesla where I explain how the hidden buffer below 0% works and why you can't get the predicted rated range in the Model 3's Energy Graph from 100% to 0% (or any other Tesla) if you follow the consumption on screen. This has been discussed at...