Again AE uses gasoline and BrE uses just petrol. Ethylization of benzine and petrol blending Chemical characteristics and petrol content Benzine is a complex mixture of hydrocarbons, mainly within the range C5-C10(C4-C14) and it includes alkanes (paraffins), alkenes (olefins), napthenes (cycloparaffins) and aromatics. 1.
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Alan.esOlefin is always spelled with an 'f' even in BrE, confusing:-)Olefin: That is because of its latin origin (oleum facere - making/constituting oil) rather then ancient greek.