[Kurt in NJ]

I did some experiments with old gas, first in the lawnmower--- it would spark knock in heavy grass--- the model A was empty, I put that gas in the A wet to the steepest hill around, the ocean city bridge, full advance from 10 mph at the bottom, crested at 45--- no spark knocking
When I was driving a Mercedes 240D I ran it on a lot of spoiled gas, used transmission oil, and once on a gallon of pure antifreeze--- I did that by accident, the next day I went looking for it by draining the tank, and fuel filter-- it was gone, never noticed any difference in running

It's not something to put in the tank and park the car, I only use old gas in the A if I am going to drive enough to use it all and run fresh gas enough to have flushed the concoction out the tailpipe