I have no data to back it up but my personal experience is that "it depends". If the gas is stored in an air tight container, my experience is it's likely still good. For example I'm still using gas (that has 2 stroke oil mixed with it) in my chainsaw that's several years old. It starts and runs fine every time I fire it up. It's stored in an air tight can. The other side of that coin is if the gas has been exposed to the air for a year where moisture can get in and volatile compounds can escape I wouldn't trust it.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.