Based on presumed higher tax rate, the government on Tuesday increased the prices of petrol and high speed diesel (HSD) by Rs1.71 and Rs1.52 per litre, respectively, with immediate effect for a month.Finance Minister Ishaq Dar who said that the government had passed on to consumers a partial increase recommended by the Oil and Gas Regulatory Authority (Ogra) and would absorb an additional Rs3 billion by not fully transferring the impact of higher international oil prices.