Cal. Pub. Res. Code § 25773

(a) The program described in Section 25772 shall include all of the following:
1. (1) The development and adoption of minimum energy efficiency standards for replacement tires, except to the extent that the commission determines that it is unable to do so in a manner that complies with subparagraphs (A) to (E), inclusive. Energy efficiency standards adopted pursuant to this paragraph shall meet all of the following conditions:
  1. (A) Be technically feasible and cost effective.
  2. (B) Not adversely affect tire safety.
  3. (C) Not adversely affect the average tire life of replacement tires.
  4. (D) Not adversely affect state efforts to manage scrap tires pursuant to Chapter 17 (commencing with Section 42860) of Part 3 of Division 30.
2. (2) The development and adoption of consumer information requirements for replacement tires for which standards have been adopted pursuant to paragraph (1).
(b) The energy efficiency standards established pursuant to paragraph (1) of subdivision (a) shall be based on the results of laboratory testing and, to the extent it is available and deemed appropriate by the commission, an onroad fleet testing program developed by tire manufacturers in consultation with the commission and the board, conducted by tire manufacturers, and submitted to the commission on or before January 1, 2006.
(c) If the commission finds that tires used to equip an authorized emergency vehicle, as defined in Section 165 of the Vehicle Code, are unable to meet the standards established pursuant to paragraph (1) of subdivision (a), the commission shall authorize an operator of an authorized emergency vehicle fleet to purchase for those vehicles tires that do not meet those standards.
(d) The commission, in consultation with the board, shall review and revise the program, including any standards adopted pursuant to the program, as necessary, but not less than once every three years. The commission may not revise the program or standards in a way that reduces the average efficiency of replacement tires.