CFR›Title 40›Chapter I›Part 610›40 CFR Part 610 Subpart D Citation40 CFR Part 610 Subpart DContainsSections 610.40–610.43CorpusDaily eCFRDisplayed edition2026-06-29Last updated2026-06-29 Subpart D—General Vehicle Test Procedures Sections 610.40 § 610.40 General. 610.41 § 610.41 Test configurations. 610.42 § 610.42 Fuel economy measurement. 610.43 § 610.43 Chassis dynamometer procedures. AuthoritySec. 511, Motor Vehicle Information and Cost Savings Act, as amended (sec. 301, Pub. L. 94-163, 89 Stat. 915 (15 U.S.C. 2011)).Source44 FR 17946, Mar. 23, 1979, unless otherwise noted. Previous C Subpart C—Test Requirement Criteria Next E Subpart E—Durability Test Procedures