Cooking oil often goes rancid pretty quickly. I like to be sure we have a few bottles on hand and always look for the farthest date when I purchase it. As others pointed out, it is the oils in nuts that cause trail mix to spoil.
I have eaten canned goods that are a couple of years past "expiration" dates and had no ill effects. Once again, others pointed out that if the can looks ok, no bulging or rusting, and the product does not have a bad smell, it will probably be good to go.
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