What does the anti-knock property of automotive gasoline mean?

[McChristopher]

The anti-knock property of automotive gasoline refers to the ability of gasoline to resist abnormal combustion (knocking) in the engine cylinders. Therefore, additives are mixed into gasoline to enhance its anti-knock properties. Additional information about gasoline anti-knock properties is as follows: 1. Strong anti-knock properties allow the use of higher compression ratio engines, which can improve engine power, reduce fuel consumption, and enhance the engine's economic efficiency. 2. To improve gasoline's anti-knock properties, tetraethyl lead additives are typically added to gasoline. Since tetraethyl lead is toxic, gasoline containing it is often dyed red for distinction to prevent misuse and poisoning.