Uh, oh, be careful. You might arouse the wrath of the FR ubercapitalists who will claim such an outcome is simply "supply and demand". Yeah, sure...
(/s)
We regularly get variations of 5 cents or more per litre during a 24 hour period.
Go past a petrol station at 9AM and the price is $1.099/litre. Go past the same station at midnight and it is $1.045/litre and by next morning it is back up to $1.099.
Weekends are now routinely over $1.10/litre
A US gallon is 3.785 litres so a 5 cent jump equates to a jump of 18,925 cents per US gallon and a price of $1.10 per litre is the equivalent of $4.16 per US gallon.
And we are a net petroleum exporting nation.