Dear frnd, Currently, the additional and special excise duty on petrol is Rs 12 compared to the Rs 6 imposed on diesel. That along with difference in the value added tax (VAT) imposed by the state governments is the reason why diesel is cheaper than petrol, even after all subsidies on both fuels were scrapped. The value added tax on petrol in Delhi, for instance, is 25 per cent. In contrast, the VAT on diesel is only 16.6 per cent. hope this will help u Be free to contact for further query ! thnku