Ethanol blended petrol exemption applies when blend composition meets required petrol ethanol ratio and BIS specification. Amends Notification No. 4/2006 to impose an effective rate of duty on Cement Clinker (2523 10 00) at the specified per tonne levy and to insert an exemption for ethanol blended petrol (heading 2710) where both motor spirit and ethanol have paid the appropriate duties of excise and the blend conforms to Bureau of Indian Standards specification 2796; the Explanation defines 'appropriate duties of excise' to include duties under the Central Excise Tariff Act and specified additional and special additional excise duties, read with relevant exemption notifications.