{"id":7329,"date":"2022-05-03T13:00:44","date_gmt":"2022-05-03T09:30:44","guid":{"rendered":"https:\/\/gamma-co.ir\/en\/?page_id=7329"},"modified":"2022-05-03T13:00:44","modified_gmt":"2022-05-03T09:30:44","slug":"gasoline","status":"publish","type":"page","link":"https:\/\/gamma-co.ir\/en\/gasoline\/","title":{"rendered":"GASOLINE"},"content":{"rendered":"

Gasoline<\/strong>\u00a0 or\u00a0petrol\u00a0 is a clear\u00a0petroleum<\/a>-derived\u00a0flammable liquid<\/a>\u00a0that is used primarily as a\u00a0fuel<\/a>\u00a0in most\u00a0spark-ignited<\/a>\u00a0internal combustion engines<\/a>. It consists mostly of\u00a0organic compounds<\/a>\u00a0obtained by the\u00a0fractional distillation<\/a>\u00a0of petroleum, enhanced with a variety of\u00a0additives<\/a>. On average, a 160-liter barrel<\/a>\u00a0of\u00a0crude oil<\/a>\u00a0can yield up to about 72 liters (19 U.S. gallons) of gasoline after processing in an\u00a0oil refinery<\/a>, depending on the\u00a0crude oil assay<\/a>\u00a0and on what other refined products are also extracted.\u00a0The characteristic of a particular gasoline blend to resist igniting too early (which causes\u00a0knocking<\/a>\u00a0and reduces efficiency in\u00a0reciprocating engines<\/a>) is measured by its\u00a0octane rating<\/a>, which is produced in several grades. Once widely used to increase octane rating,\u00a0tetraethyl lead<\/a>\u00a0and other lead compounds are no longer used in most areas. Other chemicals are frequently added to gasoline to improve chemical stability and performance characteristics, control corrosiveness and provide fuel system cleaning. Gasoline may contain oxygen-containing chemicals such as\u00a0ethanol<\/a>,\u00a0MTBE<\/a>\u00a0or\u00a0ETBE<\/a>\u00a0to improve combustion.<\/p>\n

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Gasoline Octane Number<\/strong><\/p>\n

In recent years,\u00a0car manufacturers have been requiring or recommending premium gasoline<\/a>\u00a0(a high-octane grade of fuel) for use in more of their vehicle models. The\u00a0difference in prices between premium and lower octane grades has also increased<\/a>. As a result, more people are curious about what octane is and what those octane rating numbers on gas pumps mean.<\/p>\n

Octane ratings are measures of fuel stability. These ratings are based on the pressure at which a fuel will spontaneously combust (auto-ignite) in a testing engine. The octane number is actually the simple average of two different octane rating methods\u2014motor octane rating<\/em>\u00a0(MOR) and\u00a0research octane rating<\/em>\u00a0(RON)\u2014that differ primarily in the specifics of the operating conditions. The higher an octane number, the more stable the fuel. Retail gasoline stations in the United States sell three main grades of gasoline based on the octane level:<\/p>\n