1. (1) Gasoline and gasoline-ethanol blends shall have a minimum Anti-Knock Index (AKI) of 85.

2. (2) The Department adopts by reference motor fuel regulations outlined in the 2017 version of NIST Handbook 130; "Uniform Laws and Regulations in the area of legal metrology and engine fuel quality", Chapter IV, Part G, "Uniform Engine Fuels and Automotive Lubricants Regulation" with the following exceptions:

   1. (a) Section 2.1.1, the Department adopts ASTM specification D4814-17, "Standard Specification for Automotive Spark-Ignition Engine Fuel".

   2. (b) Section 2.1.2, Gasoline-Ethanol blends shall not exceed ASTM D4814-17 Table 1 vapor pressure limits by more than:

      1. (i) 1.0 psi, when gasoline-ethanol blends contain nine to ten volume percent ethanol from June 1st through Sept 15th.
      2. (ii) 1.0 psi, when gasoline-ethanol blends contain one up to and including fifteen volume percent ethanol for volatility classes A, B, C, and D from September 16th through May 31st.
      3. (iii) 0.5 psi, for gasoline-ethanol blends containing one up to and including fifteen volume percent ethanol for volatility class E from September 16th through May 31st.
      4. (iv) Vapor pressure exceptions will remain in effect until ASTM incorporates changes to the vapor pressure maximums for gasoline-ethanol blends.
   3. (c) Section 2.2, the Department adopts by reference ASTM D975-17 "Standard Specification for Diesel Fuel Oils".
   4. (d) Section 4.4.2, If the standard color code is adopted, no color key posting is required

KEY: inspections, motor fuel

Date of Last Change: February 22, 2018

Notice of Continuation: May 5, 2026

Authorizing, and Implemented or Interpreted Law: 4-33-4