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Fill up your tanks quickly. Ontario's gas prices are set to spike to some of the highest the province has seen in seven years this week.

Dan McTeague, gas analyst and president of Canadians for Affordable Energy, said in a tweet on Thursday that prices will rise another cent on Saturday, moving up to 140.9 cents a litre.

The sudden leap will affect several high population areas including Toronto, Windsor, Niagara, Kitchener, Guelph and Barrie.

While gas also rose to the same price of 140.9 two weeks ago, McTeague said the province hasn't seen prices this high since June 21, 2014.

If you're waiting until prices drop to fill up your tank, McTeague says that prices are set to fall one cent "for Sunday to Wednesday next week."

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