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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.
If the average fuel economy of a manufacturer's annual fleet of vehicle production falls below its defined standard, the manufacturer must pay a penalty, then US$5.50 per 0.1 mpg under the standard, multiplied by the manufacturer's total production for the U.S. domestic market. [23] This is in addition to any gas guzzler tax, if applicable. [24]
An octane rating, or octane number, is a standard measure of a fuel's ability to withstand compression in an internal combustion engine without causing engine knocking.The higher the octane number, the more compression the fuel can withstand before detonating.
In addition, Top Tier fuels may not contain metallic additives, which can harm the vehicle emission system and create pollutants. As of 2018, Top Tier Detergent Gasoline is available from 61 licensed retail brands, and Top Tier Diesel Fuel is available from 5 licensed retail brands.
EPA National Vehicle and Fuel Emissions Laboratory. "Emission Standards Reference Guide" (PDF). 19 August 2015. (141 KB) for heavy duty and nonroad engines. Federal Income Tax Credits for Hybrids placed in service. EPA: History of Reducing Air Pollution from Transportation in the United States; EU
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.
Part 543: [90] Exemption from vehicle theft prevention standard; Part 544: [91] Insurer reporting requirements; Part 545: [92] Federal motor vehicle theft prevention standard phase-in and small-volume line reporting requirements; Part 551: [93] Procedural rules; Part 552: [94] Petitions for rulemaking, defect, and noncompliance orders
REC-90 is an ethanol-free, 90 octane unleaded gasoline blend designed for use in recreational/marine engines which can be damaged by the ethanol found in other gasoline blends. It is also usable in some aviation engines [ 1 ] and automotive engines, though it has not been thoroughly tested for cars and trucks.