Section R. 285.564.2 - Permissible oxygen content in gasoline; gasoline clarityRule 2.
(1) The calculated oxygen content permitted in any gasoline sample shall not exceed 3.7% by weight. The percentage of oxygen by weight shall be calculated on the basis of the oxygenate added per 1% volume, without regard to the actual gravity of the finished gasoline, as listed in the following table: Table 1
| Oxygenate added | Percentage by Weight of oxygen per 1% volume oxygenate |
| Methanol | .53% |
| Ethanol | .37% |
| Tertiary butyl alcohol | .23% |
The following are examples of calculated oxygen equivalents:
(a) Gasoline having 10% by volume ethanol. Oxygen by weight: 10 x .37 =3.7%.(b) Gasoline having 4 1/2% by volume methanol and 4 1/2% by volume tertiary butyl alcohol. Oxygen by weight: 4.5 x .53 + 4.5 x .23 = 3.4%.(c) The department shall provide oxygen equivalents for oxygenates not listed in table 1 upon request, which shall be based upon gasoline with a specific gravity of .7412 (6.17 pounds per gallon) at 60 degrees Fahrenheit.(d) There shall not be intentional addition of methyl tertiary butyl ether (MTBE) to the gasoline.(2) Gasoline shall be visually free of undissolved water, sediment, and suspended matter. It shall be clear and bright at the ambient temperature or 70 degrees Fahrenheit (21 degrees Celsius), whichever is higher.(3) The finished fuel shall be free of an adulterant or contaminant that may render the fuel unacceptable for its commonly used applications.(4) Ethanol blended with gasoline shall meet ASTM D 4806-07 (2007).(5) Gasoline used for blending with ethanol shall meet ASTM D 4814-08b (2008) and the finished blend may have a 3-degree variation from the 105ºF requirements, a 10-degree variation from 116ºF requirements, and an 8-degree variation from the 124º requirements listed in R 285.564. 4 (h) provided both of the following:(a) The gasoline used for blending with ethanol, after the time it met ASTM D4814-08b (2008), was not modified or altered in any way prior to or at the time of addition of ethanol.(b) The finished blend contains between 9% and 10% ethanol by volume.Mich. Admin. Code R. 285.564.2
1987 AACS; 2003 AACS; 2009 AACS