Depending on where you live in Canada the spread from regular to premium gasoline in the wholesale price for gas stations ranges between 6 and 11 cents a litre. However many stations charge a difference of 32 cents a litre between the two blends. The wider difference commonly seen in pump’s prices between regular and premium, is the markup gas stations charge minus GST/HST and the wholesale price difference. For a more complete explanation see:
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Taxes account for the main difference as every province in Canada has differing taxes on fuel. Differences between gas stations in the same city are typically the result of some gasbars adjusting their retail margins, which they need to cover the costs associated with running their site and honouring credit cards which often cost them 2-6 cents a litre depending on the rewards percentage.