Vehicle Code § 24013
CHAPTER 1. General Provisions
No new motor vehicle shall be sold unless the seller provides the buyer with a statement of the minimum octane number of the gasoline for such vehicle.
As used in this section “octane number” means the octane number of the gasoline adopted by the Federal Trade Commission, and if the Federal Trade Commission does not adopt an octane number, then the American Society for Testing Materials research octane number of the gasoline as defined by Section 20710 of the Business and Professions Code.