Both ways work and both will have a small error margin unless your base is actually pure VG or if you mix by volume.
I prefer the way I do it because it’s IMO a tiny bit more accurate since I use a fair amount of PG and mix by weight. I would be delighted though if Lars could find the time to fix this little issue
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I mix by weight and find keeping 2 bases works well. One is higher vg for those mixes that have over 8% flavors. Since I use 250mg pg salts I don’t even figure in that pg.
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