The effects of OLD gasoline in a classic car

I always drain my sleepers and fill the lawnmower with that crap, or the 7:1 slant will burn it no problem..The new stuff is also hygroscopic so it absorbs moisture too. I filled a little water bottle out of a jug to fill a weedwacker and I left the top off, 4 hours later the gas was yellow. That's like 'Waterworld' where they are still running waverunners and we all know those motors dont last for more than about 5 years.