What I've noticed is that after a short while on a new tank the liquid level has dropped quite a bit, more so that what I figure I have vaped. I pulled the tank out and ran a Kleenex around the inside of the cone; definitely picked up some liquid. Not a lot, but then 1/4-1/2 ml is not a lot, although it's a large percentage of a tankful. Not surprising to me-- can't see how that hard plastic of the tank can provide a decent seal.
I like my ego C but afraid that it's terribly inefficient. Anybody got any solutions for this? Heard that you can get tanks with soft caps. These might work much better.