Hi Bruce, we have a 2020 SE, with 158000km (over 500 fill ups) and have only once topped the tank up with 42l at 560km trip odometer, during summer.
Like others have reported here, we too have the electronic release button on the dash.
Our Alert generally goes off when the range is down to 60km.
Worst incident was driving to Calgary, wee hours, Stat Holiday. With the low fuel alert, we went from 50km range to a loud Alarm and Flashing --- km, and still had 21km left to get to our hotel. Google Maps told us the nearest open gas station was near the BC border, but I won't rant about Artificial Ignorance here.
When we got into NE Calgary it took 40l, so I calculated we had about 35km more range, and have kept dialled in with that knowledge.
We generally fill up whenever we get near 100km range. At 100km it takes about 34l-35l before topping up. Topping up for us is about 1.5-2l before hearing it in the fill tube but before overflowing (did that once, maybe 100ml, sorry Costco). All the math comes back to match up with the 43l/11.3gUS
Don't drain your tank. Two biggest issues are sludge, which gums up fuel filter and injectors, or worse killing your fuel pump which usually in the gas tank and expensive to replace. You might get away with it a few times, or it might break down first try depending on your fuel quality.