Methyl tertiary butyl ether (MTBE) is a new gasoline additive used to increase gasoline octane value and decrease the exhaust of some harmful pollutants, but there is still debate on its toxicology.

The etherification process for FCC gasoline is to react methanol with the isoolefines in FCC gasoline to form methyl tert-alkyl ethers on a resin type catalyst, so as to enhance the octane number.

Methyl tertiary butyl ether (MTBE), a new gasoline additive, is added to gasoline as an octane enhancer and used to reduce automotive emissions.