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Originally Posted by Aleks

You can clearly see when the dissociation happened right at the Jan '15 mark, when crude plunged and the pump price soared. While there is some loose correlation that remains, you can see that after that point there is lots of crude goes down gas goes up variance, much moreso than the graph before that point where the pump price is just a step behind the crude price.

https://xe.com/currencycharts/?from=USD&to=CAD&view=5Y

Right around Jan 2015