Reason I ask is after running it on my 2017 Prime, it gave me a 101.54% capacity left. Great if it's accurate but I have my doubts.
I used my BlueDriver OBDII scan tool, “Hybrid Battery Pack Remaining Life” is 86.3% on my 2018 with 61k. I believe other readers can do it too.
So today I drove to work in EV only mode. Temperature was a cool 17C. Distance is 25.5 km and 12 km of them is at highway speed (115 km/h for me since the limit here is still 100 km/h). Once I left the highway, I was just two km short (was at 26 km instead of 28 km) of the remaining battery left, which I find is pretty decent for driving at that speed. Once arriving at work, I had 12 km left in the battery. I guess that confirms the rating given by Dr. Prius IMHO.