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2. Antiknock agent - Wikipedia

   en.wikipedia.org/wiki/Antiknock_agent

   An antiknock agent is a gasoline additive used to reduce engine knocking and increase the fuel's octane rating by raising the temperature and pressure at which auto-ignition occurs.

3. List of gasoline additives - Wikipedia

   en.wikipedia.org/wiki/List_of_gasoline_additives

   Fuel additives in the United States are regulated under section 211 of the Clean Air Act (as amended in January 1995). The Environmental Protection Agency (EPA) requires the registration of all fuel additives which are commercially distributed for use in highway motor vehicles in the United States, [8] and may require testing and ban harmful additives.

4. Methyl tert-butyl ether - Wikipedia

   en.wikipedia.org/wiki/Methyl_tert-butyl_ether

   In the U.S. MTBE has been used in gasoline at low levels since 1979, replacing tetraethyllead (TEL) as an antiknock (octane rating) additive to prevent engine knocking. [16] Oxygenates also help gasoline burn more completely, reducing tailpipe emissions. Oxygenates also dilute or displace gasoline components such as aromatics (e.g., benzene ...

5. Methylcyclopentadienyl manganese tricarbonyl - Wikipedia

   en.wikipedia.org/wiki/Methylcyclopentadienyl...

   When the United States Environmental Protection Agency (EPA) ordered the phase out of TEL in gasoline in 1973, new fuel additives were sought. TEL has been used in certain countries as an additive to increase the octane rating of automotive gasoline but has been phased out in all countries since July 2021. [8]

6. Low-speed pre-ignition - Wikipedia

   en.wikipedia.org/wiki/Low-Speed_Pre-Ignition

   Low-speed pre-ignition (LSPI), also known as stochastic pre-ignition (SPI), [1] is a pre-ignition event that occurs in gasoline vehicle engines when there is a premature ignition of the main fuel charge. [2] LSPI is most common in certain turbocharged direct-injection vehicles operating in low-speed and high-load driving conditions. [3]

7. Tetraethyllead - Wikipedia

   en.wikipedia.org/wiki/Tetraethyllead

   Early research into "engine knocking" (also called "pinging" or "pinking") was also led by A.H. Gibson and Harry Ricardo in England and Thomas Boyd in the United States. The discovery that lead additives modified this behavior led to the widespread adoption of their use in the 1920s, and therefore more powerful, higher-compression engines. [16]