Not accurate, but a good, probably useable approximation.
These things are always a bit tricky because not ALL ether evaporates at 91 degrees, and some of the Kero will evaporate as well (but that is marginal).
Boiling point of Ether is 95F, so if you carefully (repeat: VERY CAREFULLY)) heat up to 100F and maintain that temperature for a while, that would be more accurate but it is a pretty risky operation as the vapours are not only extremely flammable but also have an anaesthetic effect on humans. So I would strictly recommend NOT to do that unless you have lab-quality equipment AND the knowledge and training to use such equipment. Ether vapours are not something you want to mess around with.