Mich. Admin. Code R. 285.564.7

Current through Vol. 24-24, January 15, 2025

Section R. 285.564.7 - Antiknock index standard

Rule 7.

(1) All uniform grades of automotive gasoline shall meet the following specified standards for antiknock index (octane):

(a) Subregular: not less than 85.0 AKI.

(b) Regular: not less than 87.0 AKI and not less than 82.0 MON.

(c) Midgrade 88: not less than 88.0 AKI and not less than 82.0 MON.

(d) Midgrade 89: not less than 89.0 AKI and not less than 83.0 MON.

(e) Premium: not less than 90.0 AKI.

(f) Premium 91: not less than 91.0 AKI.

(g) Premium 92: not less than 92.0 AKI.

(h) Premium 93: not less than 93.0 AKI.

(i) Premium 94: not less than 94.0 AKI.

(2) The test method for antiknock index shall be ASTM standard D 2700-08 (2008) for a motor engine and ASTM standard D 2699-08 (2008) for a research engine.

(3) The formula for determination of the antiknock index shall be AKI =(RON + MON) / 2.

Mich. Admin. Code R. 285.564.7

1987 AACS; 2003 AACS; 2009 AACS