Thank you
@davewill for the tip. I wish I had seen your reply earlier.
I should add that after driving the car in Dallas traffic (where speed limits are strictly ignored) I developed a case of range anxiety because of how much juice the car used while "just running errands" in North Dallas. No long drives, no freeway driving, just 3 to 6 mile surface street driving (although in hindsight I think keeping up with traffic is the culprit). So it was with great trepidation that I embarked on a 500 mile drive to West Texas. I stopped at many of the Supercharger sites along the way, never letting the charge level drop below 40%. Pure paranoia and caution. When I faced a 110 mile segment and then a 80 mile segment, of barren Permian desert, I departed early to avoid traffic, gradually climbed to a target speed of 65mph, and then used TACC to maintain that speed. The reward was some gained confidence because at the end of the 110 mile segment the charge level was around 65% and after the 80 mile segment it was 78%. I have no idea if these results are good or bad, but at least I made it. But let's not talk about how many instances of phantom braking occurred.