17ml

Hi guys I recently started vaping when I bought my istick tc 60w with melo 2 tank. I am enjoying the hell out of it...maybe to much. Melo 2 tank takes 4.5ml and I go through roughly 3 tanks a day if not more. So usage would be roughly between 13-17ml per day. I'm using the 0.3mg or 3mg liquids...