Petrol price was today hiked by Rs 3.18 per litre and diesel by Rs 3.09, the second increase in rates this month on rising international oil rates. The increase is effective from midnight tonight. A litre of petrol in Delhi will cost Rs 60.49 from tomorrow as against Rs 57.31 currently while diesel will cost Rs 49.71 per litre as against Rs 46.62 at present, oil companies announced.