Give examples of additives used to increase the octane number.

Additives are commonly used in gasoline to increase the octane number, which is a measure of a fuel's resistance to knocking or detonation. Some common additives used to increase the octane number include:

1. Tetraethyl lead (TEL): Tetraethyl lead was historically used as an octane booster in gasoline. It was added to gasoline to increase the octane rating and improve engine performance. __________ ______ ___ ________ ________ _________ _________.
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