3.D: Oregon

Thanks to a statewide E10 mandate, all the gasoline sold for automotive use within the state with an AKI below 91 must contain 10% ethanol (E10). However, the regulation includes carve-outs for gasoline for use with antique vehicles, aircraft, tools, all-terrain vehicles and racing cars. Although Oregon’s regulations make reference to AKI 91 gasolines being exempt from the ethanol mandate, they do not specify minimum octane values per grade: rather, they only set a minimum value of AKI 87 for gasolines featuring a motor octane number (MON) of 82 or higher. Conformity for grades above AKI 87 is enforceable via accuracy-in-labeling requirements only.

Oregon adopts ASTM D4814 Standard Specification for Spark-Ignition Engine Fuel as its conventional gasoline standard. ASTM D4814 spl