The first use I saw of starting fluid was to replace ether that had evaporated.

Instead of tossing the fuel, use starting fluid to replace that ether. It is easy to use the extender tube and dispense the ether against the side of the can or under the fuel level so that less goes into the air and more into the fuel. Use the can upright for this. None of the other ingredients evaporate much.

I ALWAYS use a fueler and keep a cap on the fuel can when not filling the fueler. This goes for glow or diesel fuel. Glow to keep moisture and dust out, diesel for ether loss. Use teflon plumbers tape on the can threads to seal it air tight. Eric Clutton shows how to dispense fuel from the can without removing the cap. I have not plumbed a can that way yet, but since my old fueler is getting tired, I think I''ll make one.

In the old days I dissolved several fuel bulbs before I knew how diesel fuel affected them. [&o]

George

Additional thought: During those hot days you can keep a wet towel around the fuel can or even keep the fuel can partly submerged in water to cut down on evaporation.