UNIOIL on Sunday announced a big-time cut in pump prices following weeks of oil price increases.The oil company said that the cost of diesel may be slashed by P2.60-P2.80 per liter. The price of gasoline may go down by P1.90-P2 per liter.Other oil firms are expected to announce price reductions on Monday.On January 31, oil companies raised the pump prices of gas by P1.30 per liter, diesel by P1 per liter and kerosene by P1.35 per liter.