Here where I live there are dozens of Leafs for rentals. All of them are being raped
on daily basis
by a) keeping at 100% for long periods and b) discharged to dead often c) are ONLY charged at DC (as those
rentals do not have home, they are only
charged with DC stations).
And not a single action does enough harm to lose lots of bars, since 2011.
Therefore the biggest thing is constant
heat (and not even the peaking heat as those rentals are often
driven 200 miles in one shot with multiple DC-charge cycles).
Trying to slow down degradation with all kinds of things except keeping average battery temperature low
has not worked. Some have tried, some have not. And they all lose bars too fast in hot climates.
Forget everything and get a) underground garage b)cooled garage c) white/aluminium vehicle tent (NOT cover!)
The last one will have limited effect but at least removes the direct heat from the sun/pavement.
So the answer for the topic " Optimum Charging Strategy" actually won't give meaningful results.
It does work if one has normal degradation speed (1-3% per year) - optimum charging strategy might slow it down 1%.
But getting 1% slower degradation while having 10% per year - not actually helping.
I would recommend keeping away from going below 30% as it heats up the pack more than anything above that.
And as heat is the main enemy, everything that keeps the average annual pack temperature down helps.
Yes, you actually have to do something big to get less degradation. Switching between 80% 100%, avoiding DC or 110V wont help!