So, I'm noticing that Wh/mi is improved on side streets versus highway driving at 75-80 MPH. Having done that, I ran five trials on EVTripPlanner.com to see what the Wh/mi in a hypothetical drive, via mostly side streets, to cover a final 5 miles to some superchargers. My info averages to 215 Wh/mi in largely flat-land no-wind scenarios. This is versus the Tesla-implied 'rated mile' equivalent of 256 Wh/mi that my S 70D routinely reports when I look to the trip odometers (simply the Wh divided by the loss in Rated Mile (RM) for that excursion). This leads to about a 20% increased actual range in the side-street regime versus the reported RM. Now, I recently experienced a powerless* coast from 80 MPH down to 0 on fair weather, no wind, 0 incline day... and I estimate I covered about 1.5 miles. Further, assume that the instrument cluster (IC) report of Range Miles applies normal rounding rules (round up if decimal is .5 or higher). So a pessimistic view is that 13 RM reported is really 12.5 RM in the internal Tesla formula. So, what is the real range, when dropping off a highway at 75ish MPH? 12.5 mi x 1.20 = 15 adding a pessimistic coast in: 15 + 0.9 = 15.9 mi IC reported Side theory** Range Mi street mi 20 ... 23.4 24.5 18 21 21.9 14 16.2 17.1* I was powerless... pedal to the metal = nothing. ** adds about 0.9 mi for coasting So I'm getting, normally, flat, no wind, etc., an extra 3.0 mile when dropping off the highways. Please comment.