Gas prices are set to increase on Thursday.The state-owned oil refinery, Petrojam, says E-10 87 is to move up by $4.50 to sell for $194.38 per litre and a litre of E-10 90 will go up by $4.50 to sell for $201.82.Automotive diesel oil will move up by $4.50 per litre to sell for $202.00.Ultra low sulphur diesel will sell for $208.84 per litre following an increase of $4.50.The price of kerosene will go up by $4.50, with that fuel to sell for $186.64.