A solid .83 using 28 ga, 5/6 wrap on a Tobecco kayfun. Firing it with a Kamry 100 and Sony VTC4. It's amazing the progressiong over a year in my setup. Started out using carto's, to carto tanks, to protanks on a Provari, Spinner 1300, MVP, to rebuildables, to sub ohming on a mechanical. I wish I'd learned how to build and subohm months ago. It's really a whole different ball game in vape quality. I can't use my other tanks anymore...they just don't cut it.