It's been about three-and-a-half weeks now since I filled up a couple 5-gallon containers in anticipation of power outages during a winter storm. Since I'm a dumb dumb, I did not add stabilizer at the time, but I do have some Seafoam stabilizer on hand.

I understand fuel degrades over time and running degraded fuel can damage engine parts. Should I pour the fuel into my vehicle or will that gum up my car's engine? Is it still worth adding stabilizer today so that I can continue to store it in my garage for a rainy day? The only other responsible alternative I can think of is taking it to a hazardous disposal site in my county. It's octane rating 87, I believe it also has ethanol, in case that makes any difference.