I have been keeping my carts topped off more frequently, and I have to say it makes a HUGE difference. Guess I was lazy before.. Tonight I had a huge craving for an analog and I vaped through it with my topped off margarita cart. OMG I think I got the hang of this finally. HUGE clouds of vapor, great TH. I love it. V4L is the best, and I to be honest I will never go anywhere else!! 