Oil companies increased the cost of gasoline on Tuesday, May 23 by P0.80 per liter and diesel P0.60. The price of the gas fell P0.10 per liter. Petron, Pilipinas Shell, Flying V, Seail and Unioil announced the price settings on Monday. Cleanfuel will apply the same price adjustments except the kerosene that it does not carry. Gotopnews.com