Cars don't care. They'll run on 3+yo gas (though I wouldn't risk it in anything that needs premium for reasons beyond the scope of this comment). It's stuff w

Cars don't care. They'll run on 3+yo gas (though I wouldn't risk it in anything that needs premium for reasons beyond the scope of this comment). It's stuff with carburetors that you have to worry about, particularly two strokes, marine 2-strokes seem even more finicky for whatever reason. Also, modern car fuel systems are well enough sealed that there's not much moisture ingress. The whole "gas goes bad in X months" this is basically an urban legend at this point but it's continuously propped up because most white collar people's experience with gas older than a few months is trying to pull start some piece of garden power equipment that has the cheapest carburetor known to man on it, a compression ratio in the ballpark of "maybe" and barely runs on a good day and then can't start once you make the gas even mildly less volatile. Old carburetor vehicles could certainly gum up but they'll do that with premium too. If you don't daily drive a moped, motorcycle or bicycle with one of those engine kits you'll be fine. Source: Formerly employed in an industry where filling up your vehicle with free junk gas was one of the perks of the job.