What happens if you use 92 octane gasoline in a car that recommends 95 octane?

[Julie]

Using 92 octane gasoline in a car that recommends 95 octane can cause engine knocking. Knocking refers to an abnormal combustion condition where some of the air-fuel mixture ignites prematurely before being sparked by the spark plug during the compression stroke, creating multiple flame fronts in the combustion chamber. Relevant information about gasoline octane ratings is as follows: 1. The gasoline octane rating represents the ratio of the actual gasoline's anti-knock performance to that of standard gasoline. The higher the octane number, the stronger the anti-knock performance. 2. There are two methods for evaluating gasoline's anti-knock performance: the Motor Method and the Research Method. The Motor Method specifies more stringent test conditions than the Research Method, resulting in lower measured anti-knock performance, while the Research Method yields relatively higher anti-knock performance measurements.