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How can you tell if the gas is "non-oxygenated" ?

Is it mainly by smell? I'm a little concerned about a car I have some older gas in ... but I couldn't smell anything abnormal when I took off the gas cap recently.

And if I pump out the old gas and it is bad ... should it look different?

Thanks for any tips!



You can tell by getting it from a pump that says "non-oxygenated" on it. Seriously, it is just the premium fuel with no ethanol in it. Maybe other parts of the country are different but that is how it is done in Minnesota. The blend fuels seem to deteriorate rapidly because of the ethanol in them. If there is an obvious bad smell or appearance, then I would not use it, at least not in something I care about.