If you see 72A on the charging screen while not plugged in, I think that means you can charge @ 72. Unless it has changed with the v11 UX, the display should show the maximum negotiated rate once you are plugged in (so after you plug in you mobile connector, it should show 12 instead of 72). In my experience, if a loaner didn't have the 72A charger, it would show 48 while not plugged in. That having been said, it could have changed, as I don't remember the 72 showing last time I supercharged (pre v11).