The tank cartomizers should last you all day, if not a day and a half (It really depends on how much you vape). Most tanks hold in the general neighborhood of 3.5-6ml. It takes a ml to fill up your cartomizer once and that generally lasts you about an hour, and after that it takes about a third of a ml to top off the cartomizer. The tank is just to cut down on you re-topping off your cartomizers, so you only have to do it once, instead of 5 times. I find the most juice you ever lose is when you top off, and blow a couple drops out the end. I highly reccomend you get a syringe to avoid juice waste. Topping off doesn't waste juice, you don't save any juice from vaping till a cartridge is empty.
That's like saying you put less gas in your car, if you wait till it's empty and filling it to full, instead of topping off your gas regularly. Also like a car, your CARtomizer will run much better if you top it off on the regular, rather then running it on fumes all the time.
The benifit of a tank, is while if you keep vaping a carto dry, that transition from moist to dry is what's gunna kill your cartos ability to hold liquid well. If you use a tank, the idea is it remains the same level of moist and reduces wear and tear, saving you money. Don't be stingy with topping off, you're not wasting juice, your just not wasting money by potentially ruinning a cartomizer.
So to top off:
-Get a syringe, it will really help with the minimization of juice waste. Either it goes in the carto, or it stays in the needle for future use.
-Tanks help prolong the life of your carto and reduces the hassle of constantly re-filling and potentially wasting juice...
-I generally have 1 or two tanks for flavours I have a lot of, and don't mind vaping. To change a flavour in a tank, you have to take the juice out, take the carto out, wash the excess juice out, put another carto in and refill with juice. Generally a tank is used for a juice you can commit too.
Right off the bat though, the cheapest and best thing you can do is get a syringe...blunt tip of course...
