Section, Pub. L. 92–513, title V, § 503, as added Pub. L. 94–163, title III, § 301, Dec. 22, 1975, 89 Stat. 906; amended Pub. L. 96–185, § 18, Jan. 7, 1980, 93 Stat. 1336; H. Res. 549, Mar. 25, 1980; Pub. L. 96–425, §§ 4(a)(1), (b), (c)(2), (3), 8(e), Oct. 10, 1980, 94 Stat. 1822, 1824, 1825, 1829; Pub. L. 98–620, title IV, § 402(18), Nov. 8, 1984, 98 Stat. 3358; Pub. L. 103–182, title III, § 371, Dec. 8, 1993, 107 Stat. 2127, related to calculation of average fuel economy. See sections 32901 and 32904 of Title 49, Transportation.