SAG it's good to be back after a great little vacation visiting friends and family. Now (hope Morandir doesn't mind me answering after answering on my behalf since I am now answering

) the official V4L response as I remember it was that all Cartos are filled with 1 ml of liquid at the factory. Since I don't like the thought of being attacked in the middle of the night by mutant rabid flesh-eating squirrels I will not contest that statement in this forum.
One issue with dripping into Prefills is that after a couple of days a resin type substance starts to clog up the polyfill and the bottom of the Cartomizer. This carmelization affects performance on all levels which is why I recommend a quick hot water rinse out, then a fresh full refill (have a video on this) as long as the Carto isn't burnt.
It seems to make sense that if you are going to buy blanks and juice why not by prefills and juice instead. After all it is like getting 1 free fill on the house so-to-speak before dripping in your juice. Of course the pre-fill/drip purchasing tactic also dictates what type of Cartomizer you will be using and you may find that you prefer a different Cartomizer depending on what type of use is intended. I like Cool Cartos with my Mods and PT, but I like Wow Cartos with my VK batts and certain flavors.
The official line is that the juice in the bottle and the juice in the factory are identical. If that is true I suggest you try a little test yourself, vape a prefilled, then fill a blank carto with the identical flavor and see if you immediately notice a difference. I'm not going to say there is a difference, I will let each individual decide for themselves on that....I strictly use blanks and juice. I will go as far as to say that the juices maybe identical but something else is added to the prefills.
Try doing a quick rinse and dry (need a video link, let me know) to see if that brings more life back to prefills after dripping for a few days.
Hope that helps...thanks again for the welcome back!
