Oxygenate
Oxygenate means any substance which, when added to gasoline, increases the oxygen content of that gasoline. Lawful use of any of the substances or any combination of these substances requires that they be substantially similar under section 211(1) of the Clean Air Act (42 U.S.C. 7545(f)(1)), or be permitted under a waiver granted by the Administrator under the authority of section 211(f)(4) of the Clean Air Act (42 U.S.C. 7545(f)(4)).
Source
40 CFR § 80.2
Scoping language
Definitions apply in this part as described in this section.