The reduction, effective midnight tonight, excludes local sales tax or VAT and the actual cut will be higher, varying from city to city.
The price of petrol was last increased by 60 paise on March 1 and will cost Rs 72.26 a litre in Delhi, down 90 paise from Rs 73.16 at present. In Mumbai, the fuel will cost Rs 80.89 a litre against Rs 82.07 currently.
"The combined impact of both these factors has resulted in reduction in price of petrol, the benefit of which is being passed on to consumers through price decrease of Re 0.75 per litre, excluding VAT," it said.
However, state-owned oil firms will not raise diesel prices by the monthly 50 paise a litre decided in January last year as the loss on the fuel has dipped below the threshold of Rs 6 a litre because of the twin factors.
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"Hence, the issue of monthly price increase is under consideration of the government and the matter has been referred to the Election Commission. A decision regarding revision of diesel retail price shall therefore be taken on receipt of further advice by the government in this context," IOC said.
Since January 2013, diesel rates have risen by Rs 8.33 over 14 monthly installments.
Besides diesel, oil firms lose Rs 34.43 a litre on kerosene sold through the public distribution system and Rs 505.50 on every 14.2-kg cylinder of domestic cooking gas.