Great road trip as usual out to Big Bend, but I had to leave my car in the Chisos most of the weekend and we had to cram 4 people in a Tiburon to travel around since charging was too much trouble for getting around the park this trip. Here a few things I kept track of from my trip. For reference I have a LR RWD Model 3 which maxes out at 325 miles of range. Any mileage figures is based on my car.
I used up 170 miles of range to get to the Chisos Basin campgrounds from the Fort Stockton supercharger. On the way back I used up 146 miles of range to get back. This pretty much uses up the battery completely once you factor in overnight mileage losses. I charged to 317 miles at Fort Stockton. I also was pretty much driving the speed limit in chill mode the whole time and sometimes went 5 over. I had the A/C off cruising around the park from the Chisos to Rio Grande and back, but turned it on leaving the park.
The Rio Grande RV spots is the only place to charge in the park as stated other than using a 120v outlet if you are staying in the Chisos lodge. I did not see any other options around the park. Any other charging has to be done outside the park at other RV campgrounds. I stopped by the Rio Grande RV spots to charge for 3 hours and the employee let me slide on charging a few hours, but otherwise the day use fee is $35 and it was booked overnight so it unreliable unless you reserve a spot in advance. I cleaned up trash from in the bushes around the campgrounds while charging so that was my trade-off for a few hours of charging. If you want to drive around in the park, then this is the only option to charge and stay in the park as of now. Period. $35 a night.
Going from the Chisos campgrounds to the RV charger used up 4 miles of range since it was all downhill, and used 51 miles going back. I added 30 miles of range for my drive back after factoring there and back which was enough to get back to Fort Stockton.
Cruising around on autopilot in the park works great. I am guessing it may have some issues heading to Santa Elena Canyon on the roads, and I took over for the sharp turns in the Chisos, but on the main roads it works great. I did not get the recent NOA update before my trip. Autopilot is limited to the 45mph speed limit or 5 over in the areas I checked in the park. No biggie since you have to be the most efficient you can here.
I talked to quite a few people who work at the park about EV charging, the best option they said would be to fill out the comment form and request EV charging since it goes to the superintendent. Realistically this still may take forever, so the better option may be to contact the lodge and RV campground owners and request EV charging access. Having an hourly rate to charge would be ideal, or a day use EV charging pass. I sent an email to the lodge about it and filled out the comment form.
That is all the main points for now that I can think of. I did see another Tesla Model s 75D in the park and I know they spent one evening in the RV spot charging and passed me up on the way out. As of now, big Bend is one of the toughest places to take an EV. IT can be done, but you have to plan around it accordingly. Hopefully my friend in Terlingua sets up a Destination Charger soon, since that would make the trip much easier to deal with, but we still need more options out there that do not requires staying overnight in a campground outside of the park. Otherwise I will still go back as often as possible, but may hold off on the Chisos campgrounds next time.