I have an allergic reaction to PG above certian concentrations.
Some vendors have "Propriatary" mixtures and refuse to even round off the numbers or even "Ball-park it." I simply take my money elsewhere.
Most vendors, especially the local
juice companies, are more than happy to to answer when I ask what their ratio is. A couple of them have asked that I re-direct inquires to them rather than answer myself if someone else asks.