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List of U.S. states by standard octane ratings

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This is an old revision of this page, as edited by Jesse Viviano (talk | contribs) at 23:53, 22 June 2020 (→State Octane Ratings: 87 and 88 are mid-grade in the South Dakota counties where 85 and 86 are regular.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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 82 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 82 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 87 89 90
Arizona 87 89 91
Arkansas 87 89 93
California 87 89 91
Colorado 85 87 91
Connecticut 87 89 93 86 octane may be sold if labeled as economy[1]
Delaware
Florida 87[2] 89 93
Georgia 87 [3] 89 93 [4]
Hawaii 87 89 92
Idaho
Illinois 87 [5] 89 91 93 is available at Shell and some other gas stations in Illinois.
Indiana 87 89 93
Iowa 87 91 93
Kansas 87 89 91
Kentucky 86[6] 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[7]
Minnesota <88 [8] 88 91
Mississippi
Missouri
Montana 85.5[9]
Nebraska
Nevada
New Hampshire
New Jersey New Jersey checks for fraudulent labeling of octane ratings.[10]
New Mexico 86 88 91
New York 87[11] 89 93 93 is widely available.
North Carolina 87 89 93 91 octane is commonly sold as "premium" in the western, mountainous part of the state.
North Dakota 87 [12] 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"[13]
South Dakota 85/87 87/89 91 85 octane must be sold with a warning label displayed at the pump.[14] 85 and 86 octane can be sold as regular fuel only in the counties of Butte, Custer, Fall River, Harding, Lawrence, Meade, Oglala Lakota, Pennington, and Perkins.[15] 87 and 88 can be sold as mid-grade in the previously-named counties.[15]
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

  1. ^ http://www.ct.gov/dcp/lib/dcp/pdf/laws_and_regulations/motor_fuel_quality_regs_current_12042008_(2).pdf
  2. ^ Florida Administrative Code 5F-2
  3. ^ http://agr.georgia.gov/1fuel-measures-faqs.aspx
  4. ^ http://agr.georgia.gov/1fuel-measures-faqs.aspx
  5. ^ http://www.ilga.gov/legislation/ilcs/ilcs3.asp?ActID=2339
  6. ^ http://www.lrc.state.ky.us/kar/302/079/010.htm
  7. ^ https://www.legislature.mi.gov/(S(kvnx05fhsdtufphvy1a1ste3))/documents/mcl/pdf/mcl-Act-44-of-1984.pdf
  8. ^ https://www.revisor.leg.state.mn.us/statutes/?id=239.752
  9. ^ http://bsd.dli.mt.gov/weights-and-measures/faq
  10. ^ "New Jersey Weights and Measures" (PDF). NJ Department of Law and Public Safety. Retrieved 7 September 2017.
  11. ^ http://law.justia.com/codes/new-york/2012/agm/article-16/192-a
  12. ^ http://www.legis.nd.gov/information/acdata/pdf/33-34-01.pdf
  13. ^ http://www.scstatehouse.gov/code/t39c041.php
  14. ^ https://sdlegislature.gov/Statutes/Codified_Laws/DisplayStatute.aspx?Type=Statute&Statute=37-2-39
  15. ^ a b https://sdlegislature.gov/Statutes/Codified_Laws/DisplayStatute.aspx?Type=Statute&Statute=37-2-44
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