Ok, so the VK from V4L is my first e-cig and I'm closing in on 2 weeks vaping, no cigarettes 
I haven't yet played around with juice/blank carts/filling, I've just been using up carts and tossing on the first 'off' flavor hit (meaning that burnt is not far behind). I'll get around to it eventually but for now I'm just enjoying vaping and getting a feel for how to effectively use carts.
So, do the higher nic content carts last longer? I had a 36mg peach carto I had vaped a ton off that was one of the first I used, and I just used it up tonight. I've noticed all my fruit 36mg carts are diehards, I ordered 5 in a sample pack and I just now, nearly 2 weeks in, opened my 4th out of 5. My 555 in 18's are pretty stout as well. But the 8mg carts are gone in a day and a half.
I realize that part of it is a heady respect for the amount of nic (meaning I feel free to have a longer session on lower mg's) , but there seems to be a relationship here, the higher the nic mg, the longer the cart lasts. I know I'm hitting the 36mg carts less, but nonetheless they've simply outperformed my 11's and 8's. So am I right on this or is it purely vaping style and I'm killing the 8's?

I haven't yet played around with juice/blank carts/filling, I've just been using up carts and tossing on the first 'off' flavor hit (meaning that burnt is not far behind). I'll get around to it eventually but for now I'm just enjoying vaping and getting a feel for how to effectively use carts.
So, do the higher nic content carts last longer? I had a 36mg peach carto I had vaped a ton off that was one of the first I used, and I just used it up tonight. I've noticed all my fruit 36mg carts are diehards, I ordered 5 in a sample pack and I just now, nearly 2 weeks in, opened my 4th out of 5. My 555 in 18's are pretty stout as well. But the 8mg carts are gone in a day and a half.
I realize that part of it is a heady respect for the amount of nic (meaning I feel free to have a longer session on lower mg's) , but there seems to be a relationship here, the higher the nic mg, the longer the cart lasts. I know I'm hitting the 36mg carts less, but nonetheless they've simply outperformed my 11's and 8's. So am I right on this or is it purely vaping style and I'm killing the 8's?