Excise duty increase on unblended petrol and diesel to promote fuel blending, imposing higher retail duties from specified date. The notification amends the central excise schedule to exclude fuels blended to Bureau of Indian Standards specifications from increased duties and inserts separate tariff entries for retail motor spirit (petrol) and high speed diesel (HSD) when supplied not blended with prescribed bio-components, prescribing higher excise rates per litre for unbranded and branded retail supplies and specifying a future effective date for these amendments.