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.