From Consumer Wiki
Gasoline pricing is not regulated by any state or federal agency.
State level has responsibility for measurement standards regulations for advertising, quantity, octane number, price posting, nozzle problems, absence of air, gas pumps or gauge for measuring air pressure. See Weights and Measures (County) for all county offices and phone numbers to report problems or get information.
Department of Food and Agriculture
Division of Measurement Standards
Florin Perkins Road, Suite 100
Sacramento, CA 95828
Alternative fuels, the cleaner-burning gasoline program, diesel fuel regulations, plus fuels related enforcement activities.
California Air Resources Board
1001 "I" Street Sacramento, CA 95814
P.O. Box 2815 Sacramento, CA 95812
Street Map to California Air Resources Board, Sacramento HQ
General Inquiries: (800) 242-4450 or email email@example.com
Public Information Office (media inquiries): (916) 322-2990
Gasoline sales with mandatory purchase of additional service (such as a car wash) are prohibited by California Business and Professions Code Section 20735. Complaints are handled by the local county or city District Attorney's Office for the particular county.