3.E: Wyoming

The gasoline quality requirements in the state of Wyoming conform to a conventional standard. The state’s Board of Agriculture has adopted ASTM D4814 Standard Specification for Spark-Ignition Engine Fuel as its quality standard for conventional gasoline (with modifications, as discussed below). State regulations also make reference to NIST Handbook 130 but only to the Handbook’s Uniform Regulation for National Type Evaluation which pertains to testing, and not its Uniform Regulation for Engine Fuels and Automotive Oil Regulation that prescribes fuel quality standards.

One modification entails octane requirements. On the basis of the state being a high-altitude area (per ASTM), the state regulation allows for a 4.5 AKI reduction of the minimum AKI limit of normally applicable to