1. The secretary shall adopt rules pursuant to chapter 17A for carrying out this chapter. The rules may include, but are not limited to, specifications relating to motor fuel or oxygenate octane enhancers. In the interest of uniformity, the secretary shall adopt by reference or otherwise specifications relating to tests and standards for motor fuel or oxygenate octane enhancers, established by the American society for testing and materials (A.S.T.M.), unless the secretary determines those specifications are inconsistent with this chapter or are not appropriate to the conditions which exist in this state.
2. Octane number shall conform to the average of values obtained from the A.S.T.M. D-2699 research method and the A.S.T.M. D-2700 motor method.
Octane number for regular grade leaded gasoline shall follow the specifications of A.S.T.M. but shall not be less than eighty-eight.
Octane number for premium grade leaded gasoline shall follow the specifications of A.S.T.M. but shall not be less than ninety-three.
Octane number for regular grade unleaded gasoline shall follow the specifications of A.S.T.M. but shall not be less than eighty-seven.
Octane number for premium grade unleaded gasoline shall follow the specifications of A.S.T.M. but shall not be less than ninety.
3. a. Gasoline with a mixture of ten percent or more ethanol, but not more than thirteen percent, shall be known as conventional blend ethanol.
b. Gasoline with a mixture of more than thirteen percent ethanol, but not more than twenty-five percent, shall be known as high blend ethanol. For purposes of chapters 323A, 422, and 452A, high blend ethanol shall be treated as conventional blend ethanol.
c. Gasoline shall not contain a mixture of more than twenty-five percent ethanol.
4. Gasoline shall not contain methanol without an equal amount of cosolvent, and shall not contain more than five percent methanol.
[C31, 35, § 5093-d2; C39, § 5095.02; C46, 50, 54, 58, 62, 66, 71, § 323.2; C73, 75, 77, 79, 81, § 214A.2; 82 Acts, ch 1131, § 1, ch 1170, § 1]
84 Acts, ch 1083, § 1; 85 Acts, ch 76, § 2-5; 85 Acts, ch 195, § 23; 89 Acts, ch 75, § 2; 90 Acts, ch 1252, § 14; 91 Acts, ch 87, §1
Referred to in § 214A.4, 214A.6, 214A.7, 214A.9
Limitation on sale of motor vehicle fuel containing methyl tertiary butyl ether on or after February 1, 2000; rules; 99 Acts, ch 204, §15, 20
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