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kersploosh
That cheaper 88 octane fuel is a blend of 85% unleaded gasoline and 15% ethanol. It’s also known as E15 fuel.
The ethanol is an oxygenate: it adds oxygen atoms to the fuel mix so the fuel burns more completely. That’s good for vehicle emissions. However, the ethanol is less energy dense than gasoline so you will get slightly worse mileage.
https://www.motortrend.com/news/what-is-e15-gasoline-pros-cons/
This exact product was used in a case of intentional poisoning in Michigan:
https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5218a3.htm
It’s amazing humanity has survived. So many old products were like “Here’s some concentrated poison. Spread it in your house, on your food, and in the air you breathe. It also makes a great toothpaste and eyeliner!”
The original, I believe: