That's about the same as me. During the day I go through about 3.6ml of 11mg and at home, for the night, I might do another .5ml. I speculate I am in the 4.0-4.5ml a day. Weekends are normally less for, as I don't vape around my daughter and wife that much, easier done at work for me..
I go through maybe 1.5 tanks of an 18mg juice during the "work day." Lounging around at home, I might refill 3 times total with a 12mg juice. I don't finish the whole tank in the evening, so it sits waiting while I am at work. So yeah, rough math, 4 - 6ml daily. Based on all my reading on here, the numbers don't concern me in the least. Fiscally I may be spending more than my initial math said I would be once I switched, but even still, I'm fine with that. I'm feeling better every day ... and still spending less ever day. I do know that once I have truely settled on an chain vaping flavor for the evenings, I will start some DIY to help my fiscal savings.