On a related note, experience says that our changes in delivery devices have caused our juice consumption to go up. When I was direct dripping I was going through 3 mls of juice a day. I moved to vivi novas and it went up to 4 mls. Since going to Protank 2s I'm somewhere around 5 to 6 mls. My vaping has stayed the same, so I'm guessing that the delivery is more efficient and/or burning through juice faster.