Gas prices for the majority of September have been fantastic for motorists but that could all change starting tomorrow.

Wholesale prices of gasoline have rose over the past week and a half and retailers can hang on at that prices without making some kind of profit.

Senior Petroleum Analyst with GasBuddy.com Dan McTeague says it was only a matter of time till prices were going to go up.

"For the past week and half, retailers are doing what they do best. Compete with each other, destroy each others retail margin, take away their operating cost which is usually about anywhere from seven to twelve cents a litre, it's down to negative one in some instances in Okotoks," he says.

The average price of gasoline as of Thursday night was $0.92 a litre.

McTeague says at least for now you'll see a significant rise coming at the latest on Monday.

'You're going to want five or six days at ten cents a litre margins which would bring us back up to about 0.99 to $1.00 a litre. If they don't move by 12  o'clock tomorrow they're probably going to give us a break on the weekend. Take advantage of it because sooner or later they have to come up and change those prices or else they will be bankrupt."

McTeague says he's surprised retailers have been able to operate at these low rates as long as they have.

"If most of us purchase our gasoline as can be expected by credit card they lose another two cents a litre. To offer gas at $0.89 cents a litre is a losing proposition and of course with wholesale prices on gasoline having gone up about four cents this week they have no choice but to eventually come up for air."

For the latest gas prices click here.

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