Not 50/50, more like 70/30 or 80/20 PG/VG... Good for tanks, not drippers imho... I used too use those figures, as great for tanks(well, older kayfun/lemo style tanks)... I think I remember Kurt uses ED VG, which atleast on paper is high viscosity.
Well, if using much flavor, then that could be 50/50 I guess, it all depends on water amount. 25% water to VG is about the consistency of PG...
Again this highly depends on viscosity of VG. I've seen COAs of VG with a record low level of 0.02% water, but the VG was for sure not like that. They measure it right after production, but afterwards it's filled into big tanks and later filled into "not-perfect" bottles and canisters(and drums before that), so the end-product varies according to how well the product is handled. Even the pre-storing viscosity also varies, from 1150mpas to 1490mpas usually(at 20/25C).