Above is a picture of my SOH versus miles driven. As can be plainly seen, I got the software update at about 37k. I've been driving for a few months since the update. I live in Seattle and drive about 15k-17k miles in a year commuting and running errands. The effect of the update was to boost the reported SOH about 9%. it appears to me that the slope of the SOH vs miles curve is approximately unchanged since the update and it appears to be about 5% per every 10k miles.
As I'm nearing the end of my lease (calendar 6/2019 or miles 45k - which I'll hit first), I'm starting to consider my end-of-lease options. Assuming the slope of the degradation remains constant it appears to me that I can expect to hit 66% (4 bar lost at about 80k miles. I think the car would cover my daily needs even at 60% as I can charge on L1 at work. I like the idea of buying the car, driving it another 40 or 50k and then getting 2nd life with a new battery.
What are thoughts on this strategy?