If you’re thinking about when to fill up the tank this week, you may want to get to the station Thursday evening — and definitely before Friday, a gas affordability expert says.

Dan McTeague, the president of Canadians for Affordable Energy, told the Star he’ll be filling up his own tanks on Thursday after 6 p.m. ahead of a likely spike in gas and diesel prices Friday, spurred by the apparent collapse of negotiations between the U.S. and Iran.