Charge it to 90% run it as hard as I want and dont think about it? Not worth even thinking about?
Im probably going to have the car for a year or two so not trying to obsess over trying to make it last forever, just find a happy medium that works for my situation and gives me peace of mind I am at least caring for the car to my abilities.
Given your stated information and goals, (and desire for performance), I wouldnt worry at all about battery degradation, hovering at 60% etc, I would just charge to 80-90% and enjoy the car. Most of that stuff is for people who either love min maxing it, or have a stated goal of "gonna drive this thing till the wheels fall off".
Whether your car has an extra 10-15 miles of range available to it a year or two from now, wont likely matter at all for your enjoyment of the car during that time. Its not like charging it to 80 - 90% is going to make the car have 70 less miles or something. Just charge it up and enjoy it, and dump it when you planned to, or not.
"I want to maximize the battery to the nth degree" and "I bought a performance car and want the performance out of it available when I want" are somewhat opposed desires. There isnt any reason to charge to only 50-60% if you are not planning on hanging onto the car "forever".
I said this in another thread, where someone was complaining about state of charge vs battery. I said the same thing as I said above, and said:
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"I equate this to me buying premium gas and only driving my BMWs around in sport mode, because I liked the throttle mapping in sport mode. Of course, I got less gas mileage, but that was a trade off I was aware I was making, and willing to make.
No different here. Charge the car to a higher percentage and enjoy the performance, and know that over time, you might lose a few more total miles than someone who min maxes, but given the fast charging network, those few missing extra miles are unlikely to matter"