jboyton:
Not for a 91% solution. The vapor and liquid have the same composition. That's why it's impossible to obtain a higher concentration via simple distillation. I think that also means it is slightly more volatile than pure isopropanol. The 91% stuff should actually evaporate as fast or a little faster.But maybe the higher concentration makes it a better solvent.
There is almost always a small amount of water in the ethanol component but it dries relatively quickly.
Anhydrous ethanol made by synthesis evaporates completely but the cooling effect can cause some condensation so there is no real advantage.