My Ellen took our 201 P85+ on a Charleston South Carolina to Charlotte round trip this weekend. Used Santee and Charlotte Superchargers and the latest software update trip planner both ways. Charlotte elevation 751. Santee Elevation 128. Basically flat the whole way home. No headwind. Clear weather. Unseasonably cool-ish temps. Running in Range Mode. Well-inflated tires. Three soccer kids. Two ladies. All was well enough on the return trip. I looked on the app to check on range and make sure they were OK on miles. At that time they were 115 road miles to Santee with 151 showing "in the tank." That's a 24% surplus. In fairness, Ellen can be a lead foot, but with a dose of Range Anxiety from a Florida adventure where we cruised at "0" for several miles so she kept to the flow of interstate highway traffic. (well, she got to 80 once per the log) My own experience is to a sub-zero reserve and multiple websites report, "The estimated range on the driver’s dash will read 0 however it’s not the end. There is an extra reserve good for another 10 – 20 miles, depending on your power consumption, after reaching the 0 mark." She called me concerned as they could literally watch the last 70 miles of range tick down to zero far faster than the odometer and the car would drive no more than 40 MPH. The last 26 miles to Santee is back road. As zero vigorously approached, the warning came that the car could shut off unexpectedly. 12V battery indicated an error (which Tesla says is "normal" to protect the HV pack). She had only 2 miles to the Supercharger and the car had several miles of range on the meter. I reminded her that the car has a "reserve" and she only had 2 miles to the charger. She immediately pulled off the road anyway and bam the car shuts off. 3.5 hours for AAA to arrive, and Ellen now has zero faith in this car for road trips. Tesla engineer says there were no battery faults, just that it ran out of power. No accounting for why the last quarter of the battery capacity wasn't accurate. Tesla said nobody really gets 260 miles in real world conditions - I get that but dang. When the last 70 miles gets you less than 30, and the car flatly shuts off, that signifies a problem to me. Puzzled! And for what it's worth, the Ranger service is no longer a flat $100. It's $3/mile each way. $1,000.