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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General Ethyl tertiary-butyl ether (provided for in subheading 2909.19.18) and any mixture containing ethyl tertiary-butyl ether............................................................................................... 1/ 9901.00.52 Before the earlier of 1/1/2012, or the date on which Treas. Reg. §1.40-1 is withdrawn or declared invalid, except that the rate for articles described in this heading shall not apply during any period before 10/1/2000 during which the Highway Trust Fund financing rate under section 4081(a)(2) of the Internal Revenue Code of 1986 is not in effect 5.99¢/ liter 2/ No change (A, E) Free (CA, IL, MX) See U.S. note 3(e) (CO, PE) 5.99¢/ liter 2/ 1/ 1/ See chapter 99 statistical note 1. 2/ See subchapter I, U.S. note 1. Rates of Duty 1 Harmonized Tariff Schedule of the United States Revision 15 (2026) Annotated for Statistical Reporting Purposes XXII 99 - I - 4 Note:The shaded areas indicate the provision has expired