What happens if you put 92 gasoline in a car that requires 95?

[Rafael]

Using 92 gasoline in a car that requires 95 can damage the pistons or cylinders, potentially leading to engine failure. The difference between 92 and 95 gasoline lies in their isooctane content: 92 gasoline contains 92% isooctane, while 95 gasoline contains 95%. Additionally, the anti-knock properties of these fuels differ. Anti-knock refers to the resistance to knocking, which is an abnormal combustion phenomenon in gasoline engines. The anti-knock property indicates a gasoline's ability to resist knocking under various operating conditions, measured by octane rating—higher octane means better anti-knock performance. The anti-knock capability of gasoline is related to its chemical composition.