Well I went through about 200ml last year but I also dumped some cause I switched to different flavors that only use like 2-3% and I only vape 2mg nic. Went to the new flavors because less gunk and I use mainly only nickel so coils last longer. Going to try titanium which the coils are supposed to last 1-2 months and still have TC, that is when they can get it dialed in at YiHi. Right now it's hit and miss. I haven't tried it yet but will in the next few days. Supposedly works better with the SX in Ni mode then in Ti mode but I am watching everyday for YiHi to put out a better firmware for the Ti.Hey Legs, just how long would that nic last you in your 50/50 solution ? I like 6mg for nic strength.