I set mine for 70%, and begin to charge to a higher level a few hours before setting out for driving based on what I expect. I use 90-95% if I expect a leg higher than 180 miles actual, but otherwise tend to use 85% on trips. All the advice I have had suggests that if you do use range charging, or any state above 80% you should begin driving within an hour or so of reaching the high charge state. Other people know lots more than I do about this though.
A big exception for me is the occasional time when I must leave my car off a charger for an extended period. I have done this twice so far. The last time I charged to 90% before leaving my car for a one month trip and the car was at 60% on return, exactly 1% per day drop. Thus in future I'll probably charge only to 80% if I must do that again. My temperatures were South Florida spring, typically 23-30 Celsius. This is not a good idea as a regular thing but I do notice that the CPO and other company owned teslae (that must be the correct plural of Tesla?) also are not regularly connected so I surmise that there is no major harm in this. battery aficionados will have more well informed opinions.
Yet another point. I do have some experience with fairly long legs, Savannah-St Augustine, for example. I have done that 170 mile leg with range charging once, with 55 miles left at arrival, and at 90% once with 40 miles at arrival. Driving at 75 mph most of the time I used 320 kwm both times. That seems probably better performance than promised. I do not have enough experience or data top trust that yet. I recently drove Charlotte-Santee, 168 miles, after doing a 30 minute demo ride with four people in Charlotte that has a surfeit of launches and assorted other power guzzling behaviour. I had range charged prior to leaving my hotel. I drove 80 mph or so most of the way with a couple bursts to much higher speeds. The total distance I drove on the leg was 205 miles and I still had 35 miles rated range at Santee. In short, my P85D, anyway, seems to do better than the books say.
So 70% daily charge takes care of everything I normally do without dropping below 30%, including interminable South Florida bad traffic and imprudent use of P85D power reserve.
Final point, maintaining lower SOC on my charger save money because i use free ones and Superchargers for anything trip-related. Why I am penurious about it when we pay the prices we do is a mystery, analogous to shopping for best gas price when one is driving a Maserati, but I did that too.
Sorry about the long-winded reply. I guessed more information might be better than less, even though i do not have a huge amount of experience.