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EC-Premium is the second gasoline designed and commercially introduced by ARCO to reduce air pollution in Southern California. EC-Premium is designed to be used in cars using unleaded gasoline requiring the performance of a high octane gasoline. As with EC-1 Regular, the changes made to the gasoline include the addition of an oxygenate (MTBE), reduction in olefins content, reduction in aromatics content (and heavy aromatics in particular), reduction in benzene content, and reduction in volatility.