Very interesting read. Thank you. I'm currently in the process of getting a new battery on my 2016 Soul EV. I don't have all the data you have.
I'm in Los Angeles area and do mostly freeway speeds, about 70 miles roundtrip per day. I'm the original owner of my vehicle. In about January, I noticed noticeable degradation in my actual driving range. During my regular service visit to the dealer, I told the service guy. He tried to tell me that a software update that he was going to install would fix it by "allowing the car to accept a better charge." This didn't make any sense to me. That service rep never followed up with me and wasn't even there when I picked up the car to go over what work had been done. I am skeptical whether he did any work that day. I think he was full of $hit.
I continued driving my regular commute with range decreasing more and more, to the point that I was well below 50% battery by the time I got to work (35 miles) and would have to use a DCFC every day, just to make it back home. I kept at it until, finally, in early April, I decided that I, absolutely, had to get it checked.
Took it back to the dealer (CarPros Kia Glendale). Scheduled with a different service rep. He told me the EV tech would have to check it out. Later that day, he called me to tell me that they'd been in contact with Kia and needed to do more testing over the next few days. He offered me a loaner car at that point, which I turned down because I had a vehicle available to me.
After a few days, he called me back to let me know that the battery was, indeed, degraded and would be replaced and a new battery was on order. He offered me a loaner car again, which I declined again.
After about a week, he called me again to tell me the battery was on order, but there wasn't an ETA and that the batter was on back-order. He offered me a loaner a 3rd time and I accepted. They setup a rental with Enterprise and got me an ICE Kia Soul.
It has now been 2 full months since I dropped off my car. The battery has not arrived yet. I'm still driving the ICE loaner car, paying up the nose for gas every 5 days. My daily commute has increase about 45-60 minutes each day because I can't use the HOV lanes.
Somebody from corporate contacted me, told me he would be handling my case and he would be the point of contact for me, but he didn't have any information other than "the battery is back-ordered". He did tell me that once my car was fixed, he would discuss "good will" options with me.
You lucked out getting your battery replaced so quickly. As of today, I'm going on 65 days since I last saw my car.