Gas prices will inch up slightly on Thursday, while all other categories of fuel will see declines. A litre of 87 and 90 gasoline will sell for $0.25 more. However, diesel and ultra low sulphur diesel will see their third week of consecutive declines, selling for $4.50 less. Kerosene will also decline by $4.50. The price of propane will decline by $0.93, while butane will sell for $1.17 less.