It's very hard for me to get an exact count on how many ml of nic I go through each day since I use so many different devices each day. I've got a few pods at work and 10-12 mods with tanks in rotation at home and in the car. I can't really stand to vape the same flavor all day so all I can really do is guestimate. I did compare my 12mg usage to what it would be if I was using 10mg and it makes a pretty big difference on how long a bottle will last. I don't want to have to vape more ml than I do already but might try mixing some 10mg next time I mix and see if I notice a difference.