California CodesBusiness and Professions Code - BPCDivision 5 — Weights and MeasuresChapter 14 — Fuels and LubricantsArticle 5 — Standards for Spark-Ignition FuelsSection 13440

(a) The department shall establish specifications for automotive spark-ignition engine fuels. The department shall adopt by reference the latest standards established by a recognized consensus organization or standards writing organization such as ASTM International or SAE International, for automotive spark-ignition engine fuel, except that no specification shall be less stringent than required by any California state law.

(b) Any gasoline-oxygenate blend containing methanol shall also contain an alcohol cosolvent (butanol or higher molecular weight alcohol) in an amount equal to or greater than the volume percentage of methanol except those blends previously granted a waiver by the United States Environmental Protection Agency.

(c) The antiknock index as defined in Section 13400 for gasoline, gasoline oxygenated blends, and dimethyl ether-propane fuel blends shall not be less than 87.

(d) Gasoline and gasoline-oxygenate blends shall meet the latest specifications set forth in ASTM International Standard Specification D4814.

(e) Notwithstanding any other provision of this section, gasoline sold for use in Inyo or Mono County, or the portion of Kern County lying east of the Los Angeles County Aqueduct, shall comply with the latest specification set forth in ASTM International Standard Specification D4814 relating to volatility class standards for the season during which the gasoline is sold for either the interior region or the southeast region of California.

(f) Ethanol fuel blends shall meet the latest specifications set forth in ASTM International Standard Specification D5798.

(g) Methanol fuel blends shall meet the latest specifications set forth in ASTM International Standard Specification D5797.

(h) Liquefied petroleum gas for use as a motor vehicle fuel shall meet the latest specifications set forth in ASTM International Standard Specification D1835.

(i) Dimethyl ether-propane fuel blends for use as motor vehicle fuel shall meet the latest specifications set forth by the ASTM International. If no ASTM International specifications exist, the secretary shall establish interim specifications by regulation.

(j) Natural gas for use as a motor vehicle fuel shall meet the latest specification set forth by the ASTM International or SAE International.