(1) The bureau, with the advice and counsel of NIST, adopts, except as provided in (2), the regulations concerning fuel specifications and gasoline-oxygenate blends. The regulations are published in NIST Handbook 130, 2012 edition, subpart G, Uniform Regulation of Engine Fuels, Petroleum Products, and Automotive Lubricants.

(a) A copy of NIST Handbook 130 can be obtained from the United States Department of Commerce, National Institute of Standards and Technology, National Conference of Weights and Measures, Gaithersburg, Maryland 20899-0001. The web site is www.nist.org.

(2) The following are the minimum antiknock index requirements for the various grades of gasoline sold in Montana and supersede the minimum requirements contained in paragraph 3.2.5, Table 1, p. 180, of Handbook 130:

Term	Minimum Antiknock Index
Premium, Super, Supreme High Test	91
Midgrade, Plus	88
Regular Unleaded with Lead Substitute	87
Regular, Unleaded (alone)	85.5