Drivers in Ottawa will be paying a bit more at the pumps on Wednesday. Canadians for Affordable Energy president Dan McTeague says gas prices will rise five cents a litre at stations in Ottawa on Wednesday. The average price for regular gasoline will be 168.9 cents per litre on Wednesday, according to McTeague. Diesel prices are set to rise to 185.9 cents per litre. Prices so far this year peaked at an average of 196.9 cents per litre in May.