Is the trip planner calling for stopping at all of the same SpCs either way? That doesn't seem realistic -- in a 90 you could certainly skip
some that would be necessary in the 60. Does "Charge time" include the time to get to and from the charger, or is that still counted in
"Drive time"?
The problem with SpC placement today is the superchargers are often placed just right for traveling with a 60, but that is just a little too far apart for traveling with a 90 and only hitting every other SpC. As the network fills out, I expect they will be putting SpCs about halfway in between the existing SpCs and that will make skipping much easier with a larger battery. That is beginning to happen in some parts of California. I took my only long trip shortly before the Santa Nella (Gustine) SpC was started. On my next trip I can probably skip the Harris Ranch one all together, and if they put a new supercharger in just north of Sacramento, I can skip Manteca (which is 7 miles east of I-5 and takes a long time off the freeway to get to). With a North Sac supercharger, I can also skip Corning and go directly to Mt Shasta.
Right now you have to make small stops in a 90 because the SpCs are often too far apart for skipping. With an S100D skipping will likely be more feasible. Making the run from Gustine to Corning is possible with an S100D without fear of running out short of the destination.
I remember that time as well. Avoiding 99 and taking the new I-5 through Central Valley required planning gas stops because there were so few options to fill up (sound familiar to Tesla drivers?). Driving I-5 was also really, really, really boring! (Perhaps it still is — haven't been on it in more than three decades.) The advantage was the 70 mph speed limit, which was rare at the time.
Most of the towns in the west valley have built oases of gas stations and fast food right off I-5. The Harris Ranch supercharger is in one of these built on the edge of a huge cattle ranch. The supercharger is a short walk from the Harris Ranch restaurant and store.
There are few stretches now without gas. I think the longest is about 50 miles. Compared to SR 99, I-5 is still very, very boring. The stretch from Stockton to the Grapevine (the mountains at the southern end of the valley) there are very few things to see. I've found myself looking forward to the feedlot at Harris Ranch even though it stinks to high heaven because it's something to break up the monotony. There's also a prison to look forward to.
One time back in the early 90s I was going down to see family in Bakersfield and was driving alone on that stretch trying very, very hard to stay away, even though I was doing 80 mph. I saw a string of cars coming up behind me so I pulled over into the right lane to let them by. Just as the first car's front wheels came in line with my back tires, he had a blow out of the left front tire and went into the dirt median. He was unhurt, but the front end of the car pretty much came loose. The hood and fenders did not look attached.
If it had been the right front he would have taken me out too. I had no trouble staying awake the rest of the trip!.
Driving I-5 on autopilot with planned stops for supercharging, I found it was a lot easier to stay awake. The AP kept reminding me every few minutes to pay attention and there was the quirk of the version 8.0 firmware that AP tried to steer the car into most highway bridges before veering off. It kept the adrenaline going. Looking forward to the next charging top and having the ability to walk around a bit helped both keep my body from getting the typical aches and pains and it helped with keeping me awake.