Lets see, when I first started about a month ago, I was going through maybe 1ml(18mg) a day using eGo-C. Since then, I have upgraded to GG Stealth using Boge LR cartos in a tank. Now, I would say I go through 1-1/2 ml(12mg) a day. Seems ever so slowly, I am going through more and more each day. It might be because I found a set-up and the juice that I like or it might be because I am using a LR carto and its burning up jucies faster than my eGo-C. I don't mind using more juices long as I stay away from the analogs. Thats all that matters in the end.