Methyl-tertiary-butyl-ether, or MTBE is the most commonly used fuel ether in Europe, followed by the biofuel Ethyl -tertiary-butyl-ether, or ETBE, the tertiary-amyl-methyl-ether, or TAME, and finally tertiary-amyl-ethyl-ether, or TAEE.
Further reading: Fuel ethers – Benefits and Uses