Southwest Missouri in the Ozark Mountains and Mark Twain primarily only sell 87/89/91 Some Phillips 66, Break Time, and Conoco stations sell 91 octane premium. Premium gas must be at least 93 octane if it contains 10% or more of ethanolĨ5 and 86 octane may be sold if labeled as subregular ġ10 octane fuel may be available at certain locations in southern parts of the state. 93 is available at select Kum & Go and Murphy USA / Walmart locations. Many stations will offer "Super Unleaded" 87 that contains 10% ethanol and a more expensive "Unleaded" 87 with no ethanol. Many fuel stations now offer an 88-octane fuel blend that is 15% ethanol, suitable for use in some gasoline-powered automobiles from model year 2001 and newer. Elsewhere in Illinois, 93 is offered at Shell and select other stations. Octane ratings in Eastern Idaho are 85/87/91 in Western Idaho the octane ratings are 87/89/91.ĩ3 is widely available in the Chicago area. 93 octane is available at select Kum & Go's in the Northwest region of the state.Ĩ6 octane may be sold if labeled as economy ĩ1 octane premium is sold at select stations alongside 93 octane.
Northwest Arkansas primarily sells 87/89/91 octane.
Ethanol's effect on octane is not considered-these are ratings that are seen at the pump. 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. However 85 and 86 octane gasoline can still commonly be found in several rocky mountain states but availability is declining due to fewer cars with carburetors being still on the road and they are already gone in many states that previously sold it like Alaska, Maine and North Dakota. Regardless of legality fuel with an octane rating of less than 82 is generally not offered for sale in most states. Older cars with carburetors could operate with lower octane fuel at higher elevations. A minimum 82 octane fuel is recommended for most vehicles produced since 1984. 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. In the United States and Canada, octane ratings are in AKI, commonly shown as "(R+M)/2". Most states do not mandate certain standard gasoline grade octane ratings. ( April 2019) ( Learn how and when to remove this template message) Statements consisting only of original research should be removed.
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