I purchased it on July 31, 2019, picked it up on August 5th; garaged it until mid-September when I burned up my existing lease mileage at 44,640 and then started driving it full time for Uber (about 1,000 miles weekly average) until the pandemic stopped that at the end of February, 2020.
Now at 23,200 miles.
Yes, I do still subjectively notice better battery mileage.
I take advantage of of this "extra" capacity by now setting it to charge to 93% so that I always have Regenerative Braking available to me from the start of my drives. I am such a confirmed one-pedal driver, that when I infrequently drive my ICE vehicle, I have to remember to brake! 
I did have the software update installed recently for better battery capacity, as well, but really did not notice any change after that. It was not required for my vehicle, but I cajoled them into installing it! (You posted to the notice on this forum about it, so you are well away of it).
Of course, the 2020 builds on this capacity, but I am very happy with this vehicle, especially as compared to my previous 2017 lease.
My pandemic "get out of the house" events are long drives usually up north and east or west; many times to the High Desert of Mojave, Victorville, Tehachipi, etc. and this car almost drivers itself!
I just made a flash drive of some music and will be testing that on my next drive; to add to AM, FM, SXM and my iPhone (which is connected wirelessly to Apple CarPlay with some $150 device I purchased and reported on somewhere else here on this Forum).
And your experiences? How is the "LOW battery being dead" problem working out for you these days? I have gone down to 3% according to My Chevy with no problems.
