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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.
The octane rating of gasoline is measured in ... only ethanol gasoline containing 10% ethanol is allowed to be sold：92E10，95E10 and 98E10，Some gas pumps use the ...
High percentage ethanol mixtures are used in some racing engine applications as the very high octane rating of ethanol is compatible with very high compression ratios. Ethanol fuel mixtures have "E" numbers which describe the percentage of ethanol fuel in the mixture by volume, for example, E85 is 85% anhydrous ethanol and 15% gasoline. Low ...
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In some countries, pumps can mix two fuel products together before dispensing; this is referred to as blending or mixing. Typical usages are in a "mix" pump to add oil to petrol for two-stroke motorcycles, to produce an intermediate octane rating from separate high and low octane fuels, or to blend hydrogen and compressed natural gas ...
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. The EPA also regularly reviews the health and net economic benefits of Clean Air Act policies.
Misconception: Premium gasoline improves fuel economy. “One of the most persistent myths surrounding gasoline is that using premium, high-octane fuel will improve a vehicle’s fuel efficiency ...
Unlike most stations in the plains states which carry ethanol-free 87 octane unleaded alongside 10% ethanol 87 octane unleaded, many states carry ethanol-free gasoline specifically marketed as recreational fuel designed for marine equipment and small engines. Pump grades at the Brighton, MI Sunoco, including Rec-90 ethanol-free 100% gasoline.