The effects of OLD gasoline in a classic car

If you seal the container and keep it out of the sun, even the crappiest gas can age well.
Try it for yourself.
Take two glass quart sealers, fill them halfway with fresh 10% gasohol, and mark the level, Then seal one of them, put it in a cool dark place. The other one you leave open, and in, indirect sunlight.Take a picture of that one every 7 days until it turns dark orangy-red, noting the liquid level.
After two weeks, pour some of that crap gas on the concrete floor and see if you can light it, and if you can, watch what it does.
Now go get that other one, and do the same.
Shazzam!
I used to do this test for A-holes that brought there stuff back to me for warranty, saying I screwed up; and insisted their gas was fresh in their whatever equipment. I'd say something like "'Hang on jerkoff, lets see if your fresh flipping gas will burn". So I poured out some of his gas and with a bar-B-que lighter , got it going. And there was his gas sputtering and smoking and stalling out.
Then you see the A-hole do one of two things; own-up or efoff.
Either way, there was no more talk of warranty.
Sometimes I even made a new friend. No not the efoffer.
That was a long time ago; I don't talk like than no more.