If you store your gas in the basement of the shed, and check the temperature there, you'll likely find that it is pretty much the same temp as the ambient temp outside the shed. I suspect that if you go through all the effort to electrically vent the shed, you won't gain much regarding gas storage.Today I made a bit of a natural siphon by creating a vent at one end in the attic area so when the window is open hot air rising will suck out of the attic. When I started the process it was 126 degrees in the attic. When done it was 96.
It's a start. But I want to electrically draw more air out of the vent. A pair of computer fans might do the trick. I'm just trying to keep it from getting hot enough to potentially be blowing up my lawn equipment gasoline tanks.
That looks like the bees knees right there.