I use the ejuice me up calculator, and as any calculator I imagine, if you are using a mix that can't be obtained it will let you know. So enter all your specifics in your calc., and see if it flies. Do this as a test to see what your nic in pg/vg will do. You should be able to tell if a 100% in either pg or vg will work, or even a 50/50 mix. I hope this helps, and is understandable, as my head is still a little foggy as I type this.