Since I bought it 14 months ago I've been charging at 10amps at home mostly and mostly daily topping up 6Kw (10%) which is my daily drive. For this I have (in the brighter half of the year) drained my Powerwall2 of excess power, which then charges the next day. In a couple of days in having 32 amp circuit installed so I can charge up to 40Kw over night on the AGL EV Night Saver plan. I will track the 100%/ km rate over the coming months and see if fewer charges but charging more Kw makes a difference.
I'll post some updates for those interested.