Tetraethyllead (commonly styled tetraethyl lead), shortened to TEL, is a chemical compound with the formula (CH3CH2)4Pb. They add this into petro-fuel. It is first being mixed with gasoline beginning in the 1920s. This has caused increased vehicle performance and fuel economy. TEL had been identified chemically in the mid-19th century. In recent years, this chemical has been linked to climate change and is highly toxic.
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- "After Lead?", Popular Science (October 1987 ed.), Bonnier Corporation, p. 94, October 1987
- "TETRAETHYL LEAD - National Library of Medicine HSDB Database".