List of U.S. states by standard octane ratings

Most U.S. states do not mandate specific gasoline octane ratings. In the United States and Canada, octane is measured using the Anti-Knock Index (AKI), commonly shown as "(R+M)/2". All states require pumps to display the correct octane rating, and most conduct regular compliance testing. Since 1984, 87 AKI has been the recommended minimum for fuel-injected vehicles. Older carbureted vehicles that required 87 AKI at sea level could use 85 AKI at higher elevations, so 85 octane was widely sold in the Rocky Mountain states and other high-elevation areas. However, as carbureted vehicles have disappeared, the availability of lower-octane fuels has declined, and they have already been phased out in states such as Alaska, Maine, and North Dakota.

State octane ratings

Map of the US by premium gas minimum

The octane ratings below are the lowest allowed by law for unleaded fuel 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 Mid-grade Premium Notes
Alabama 87 89 93
Alaska 87 88.5 90
Arizona 87 89 91
Arkansas 87 89 91 93 octane premium is sold at select stations
California 87 89 91
Colorado 85 87 91
Connecticut 87 89 93 86 octane may be sold if labeled as economy[1]
Delaware 87 89 93
Florida[2] 87 89 93 91 octane premium is sold at select stations alongside 93 octane.
Georgia[3] 87 89 93
Hawaii 87 89 92
Idaho 85/87 87/89 91 In eastern Idaho’s higher elevations, octane grades are 85/87/91, while in western Idaho they are 87/89/91.
Illinois[4] 87 89 91 93 octane premium is sold at select stations
Indiana 87 89 93
Iowa 87 89 91 Select stations sell "Super Unleaded" 87 with 10% ethanol, ethanol-free 87, and 93 octane premium.
Kansas 87 89 91 93 octane premium is sold at select stations
Kentucky[5] 87 89 93
Louisiana 87 89 93
Maine 87 89 91/93 Premium is 91 without ethanol, or 93 when blended with 10% or more ethanol
Maryland 87 89 93
Massachusetts 87 89 93
Michigan 87 89 93 85 and 86 octane may be sold if labeled as subregular[6]
Minnesota 87 89 91 110 octane premium is sold at select stations
Mississippi 87 89 93
Missouri 87 89 91/93 Premium is 91 without ethanol, or 93 when blended with 10% or more ethanol
Montana[7] 85.5 88 91
Nebraska 87 89 91
Nevada 87 89 91 High-elevation areas in eastern Nevada use 85/87/91 octane ratings.
New Hampshire 87 89 93
New Jersey 87 89 93
New Mexico 86 88 91
New York[8] 87 89 91/93 93 octane premium is sold at select stations
North Carolina 87 89 91/93 91 octane is commonly sold as "premium" in the western, mountainous part of the state.
North Dakota[9] 87 89 92
Ohio 87 89 93
Oklahoma 87 89 91
Oregon 87 89 92
Pennsylvania 87 89 93
Rhode Island 87 89 93
South Carolina 87 89 93 Lower-octane gasoline may be sold if labeled as "sub-standard" or "sub-regular".[10]
South Dakota 85/87 87/89 91 In designated high-elevation counties, 85 (with 87 as mid-grade) may be sold, with a warning label at the pump.[11][12]
Tennessee 87 89 93
Texas 87 89 93 El Paso, Lubbock, and Amarillo areas use 86/88/91 octane ratings.
Utah 85 88 91
Vermont 87 89 93
Virginia 87 89 93
Washington 87 89 92
West Virginia 87 89 93
Wisconsin 87 89 91 93 octane premium is sold at select stations
Wyoming 85 88 91

References

  1. ^ "Connecticut Department of Consumer Protection" (PDF).
  2. ^ Florida Administrative Code 5F-2
  3. ^ "Fuel & Measures FAQs - Ga Dept of Agriculture". Archived from the original on September 26, 2011.
  4. ^ "Motor Fuel and Petroleum Standards Act". Illinois General Assembly.
  5. ^ http://www.lrc.state.ky.us/kar/302/079/010.htm
  6. ^ "Motor Fuels Quality Act of 1984" (PDF). Michigan Legislature. 2021-12-02. Archived from the original (PDF) on 2021-12-05.
  7. ^ "Frequently Asked Questions".
  8. ^ "2012 New York Consolidated Laws :: AGM - Agriculture & Markets :: Article 16 - (176 - 197-B) WEIGHTS AND MEASURES :: 192-A - Fuel octane labelling requirements".
  9. ^ "Article 33-34: Petroleum and Fuel Products" (PDF). North Dakota Legislative Assembly.
  10. ^ "Code of Laws - Title 39 - Chapter 41 - Gasoline, Lubricating Oils and Other Petroleum Products".
  11. ^ "South Dakota Legislature".
  12. ^ "South Dakota Legislature".
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