Fuel prices continue to escalate in all metro cities as petrol was retailing at Rs 82.36 per litre on Friday, an increase of 10 paise from Thursday’s price. While In Mumbai, the petrol prices raised by 8 paise to Rs 87.82 per litre, the fuel was retailing Rs 84.19 in Kolkata, up 10 paise, and Rs 85.61 in Chennai, an increase of 11 paise.