My target is set to 4.5-8.5 (I think that's what the default must've been), but I only get to about 50-55%, its very variable though some days I can get 65-83%, other days I will get 25%! (those days are the days it just wont drop below 12 no matter what you do and when it comes to 4pm I don't want to take anymore insulin cos I know I'll be driving home soon and don't want it to suddenly drop like a rock - which it sometimes has a tendancy to do).
Note: despite the fact that 50% probably isn't very good , it probably a lot better than it was pre-libre, and my HbA1c is now between 43 and 48.