I'm on Day 2 with my Ego batteries. I'm especially liking the warmer vapor (and looking forward to the delivery of some LR batteries for what I hope is even more of that). I haven't been keeping close track, but I seem to be getting fewer drags per 3-drops than I did with my 510. It may just be that I'm holding down the button longer out of enjoyment. But I'm curious as to whether others found that your juice consumption went up significantly when you switched.