CFR›Title 18›Chapter I›Part 281›Subpart C ContainsSections 281.301–281.305CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart C—Alternative Fuel Determination Sections 281.301 § 281.301 Purpose. 281.302 § 281.302 Applicability. 281.303 § 281.303 Definitions. 281.304 § 281.304 Computation of alternative fuel volume. 281.305 § 281.305 General rule. AuthorityNatural Gas Policy Act of 1978, 15 U.S.C. 3301-3432; Department of Energy Organization Act, 42 U.S.C. 7101-7352; E.O. 12009, 42 FR 46267.SourceOrder 55, 44 FR 62490, Oct. 31, 1979, unless otherwise noted. Previous B Subpart B—Permanent Curtailment Rule