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Because they price according to "future" price. They change the prices according to what they will have to pay in the future, regardless of what they have paid for the current inventory.
And of course, we have to succumb to this practice, because there is no where else to buy gas, and when one station sees the price climb, the next one will follow suit immediately. That's why gas went up 20 cents/litre overnight, and then a further 5 cents/litre the next night.
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