I'm just in constant top-off mode. You should avoid trying to
vape it all the way to empty. Once you hit empty, the next level is singed, and when you singe a carto, it's ruined. Essentially when you freshly fill or top-off a carto it'll have a nice punch of flavour, and that flavour will start to dip the longer you
vape. It's just personal preference how much flavour loss you're willing to deal with, vs how much you want to to stop and take the time to top it off.