Cal. Bus. & Prof. Code § 13404.5
The secretary shall establish the method of sale of motor vehicle fuels and lubricants sold at retail to the public. In doing so, the secretary shall adopt, by reference, the latest method of sale for motor vehicle fuels and lubricants adopted by the National Conference on Weights and Measures and published in the National Institute of Standards and Technology Handbook 130 "Uniform Laws and Regulations in the Areas of Legal Metrology and Engine Fuel Quality," except as specifically provided by the Legislature or modified, amended, or rejected by regulations adopted by the secretary. In the absence of national standards, the secretary may adopt interim standards of method of sale until the time when the standards are adopted by the National Conference on Weights and Measures and published in the National Institute of Standards and Technology.
Ca. Bus. and Prof'l. Code § 13404.5