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Regular Unleaded Mid-Grade Unleaded Premium Unleaded Notes Alabama: 87 89 93 Alaska: 87 88.5 90 Arizona: 87 89 91 Arkansas: 87 89 91/93 Northwest Arkansas primarily sells 87/89/91 octane. 93 octane is available at select Kum & Go's in the Northwest and Central regions of the state. California: 87 89 91 Colorado: 85 87 91 Connecticut: 87 89 93
Mexico: The standard octane index is 87 AKI for regular fuel and anywhere from 91 to 93 AKI for premium fuel, although 91 AKI is the most common octane number for premium fuel. Valero is the only station offering 93 AKI fuel in Mexico, at a premium [ clarification needed ] of 5% to 10% over standard 91 AKI fuel.
E20 contains 20% ethanol and 80% gasoline, while E25 contains 25% ethanol. These blends have been widely used in Brazil since the late 1970s. [96] As a response to the 1973 oil crisis, the Brazilian government made mandatory the blend of ethanol fuel with gasoline, fluctuating between 10% and 22% from 1976 until 1992. [96]
The United States became the world's largest producer of ethanol fuel in 2005. The U.S. produced 15.8 billion U.S. liquid gallons of ethanol fuel in 2019, up from 13.9 billion gallons (52.6 billion liters) in 2011, [1] [2] and from 1.62 billion gallons in 2000. [3] Brazil and U.S. production accounted for 87.1% of global production in 2011. [1]
Fuel additives in the United States are regulated under section 211 of the Clean Air Act (as amended in January 1995). The Environmental Protection Agency (EPA) requires the registration of all fuel additives which are commercially distributed for use in highway motor vehicles in the United States, [8] and may require testing and ban harmful additives.
Story at a glance In 2007, NASCAR traded leaded for unleaded fuel. Researchers studied academic performance at schools near two Florida racetracks before and after the switch. They found lead ...
The fuel for these early engines was a relatively volatile hydrocarbon obtained from coal gas. With a boiling point near 85 °C (185 °F) (n-octane boils at 125.62 °C (258.12 °F) [4]), it was well-suited for early carburetors (evaporators). The development of a "spray nozzle" carburetor enabled the use of less volatile fuels.
The ethanol-powered "flex" vehicles, as they are popularly known, are manufactured to tolerate hydrated ethanol , an azeotrope composed of 95.6% ethanol and 4.4% water. [ 21 ] The Honda CG 150 Titan Mix was launched in the Brazilian market in 2009 and became the first mass production flex-fuel motorcycle sold in the world.