LUCKNOW, May 20 -- Fuel prices in Lucknow were increased again on Tuesday-second time in the past four days. With this, the price of petrol rose from Rs.97.55 per litre on May 15 to Rs.98.42 per litre on May 19-an increase of 87 paise per litre. Similarly, the price of high speed diesel rose from Rs.90.82 per litre to Rs.91.73 per litre, an increase of 91 paise per litre. Earlier, the petroleum companies increased rates on May 15. P3...