U.S. State Fuel Octane Standards

Most states do not mandate certain standard gasoline grade octane ratings. In the United States and Canada, octane ratings are in AKI, commonly shown as "(R+M)/2". All states require gas pumps to be labeled with the correct octane level and nearly all states do regular testing to make sure gas stations are in compliance. A minimum 87 octane fuel is recommended for most vehicles produced since 1984. Older cars with carburetors could operate with lower octane fuel at higher elevations. Regardless of legality, fuel with an octane rating of less than 87 is generally not offered for sale in most states. However, 85 and 86 octane gasoline can still commonly be found in several Rocky Mountain states.

State Octane Ratings

The octane ratings below are the lowest allowed by law and may or may not reflect the actual levels offered for sale at most gas stations. Ethanol's effect on octane is not considered—these are ratings that are seen at the pump.

State	Regular Unleaded	Mid-Grade Unleaded	Premium Unleaded	Notes
Alabama	87	89	93
Alaska			90
Arizona	87	89	91
Arkansas
California	87	89	91
Colorado	85	87	91
Connecticut	87	89	91	86 octane may be sold if labeled as economy
Delaware
Florida	87	89	93
Georgia	87	89	93
Hawaii	87	89	92
Idaho
Illinois	87	89	91	93 is available at Shell and some other gas stations in Illinois.
Indiana
Iowa
Kansas	87	89	91
Kentucky	86	89	91
Louisiana
Maine	87	89	91	93 (exclusively available where Shell V-Power Premium unleaded gas is sold)
Maryland	87	89	93
Massachusetts	87	89	93
Michigan	87	89	93	85 and 86 octane may be sold if labeled as subregular
Minnesota	88	88	91
Mississippi
Missouri
Montana	85.5
Nebraska
Nevada
New Hampshire
New Jersey				New Jersey checks for fraudulent labeling of octane ratings.
New Mexico
New York	87
North Carolina	87	89	93	91 octane is commonly sold as "premium" in the western, mountainous part of the state.
North Dakota	87	89	92
Ohio	87	89	93
Oklahoma
Oregon	87	89	92
Pennsylvania	87	89	93
Rhode Island	87	89	93
South Carolina	87	N/A	91	lower octane gas can be sold if labeled as "sub-standard" or "sub-regular"
South Dakota	87	89	91	85 or 86 octane can be sold as "sub-regular" with a warning label displayed at the pump and is found in western parts of the state
Tennessee	87	89	91	93 widely available
Texas	87	89	93	El Paso area has 86/88/91 octane ratings
Utah	85	88	91
Vermont
Virginia	87	89	93
Washington	87	89	92
West Virginia	87	89	93
Wisconsin	87	89	91	93 widely available
Wyoming	85	88	91

References

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