‘Good bye catalytic converter’: Gas station customer accidentally fills up car with ‘racing fuel.’ What is it?

One would think that filling up a car at a gas station is a straightforward process. While it may be for those who are familiar with cars and their own car’s needs, the variety of options can be confusing for those not in-the-know.

For example, one user said they tried to save money on gas by going for a lower-octane fuel, only to end up with a trip to the auto shop. A mechanic noted that a car was having issues after the driver filled the tank with E85 fuel, and another internet user...