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Ethanol refers to Ethyl alcohol used as a percentage of fuel. The largest single use of ethanol is an engine fuel and additive. Ethanol combustion in an internal combustion engine yields many of the products of incomplete combustion produced by gasoline and significantly larger amounts of formaldehyde. Compared to gasoline, Ethanol has a much greater RON research octane number that means it can be less prone to pre-ignition which allows better ignition advance which also defines that there is more torque and efficiency to lower carbon emissions