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PETROL PRICE FLUCTUATIONS

I've never really paid attention before, but was told recently that when filling up on petrol I should always fill up on a Wednesday due to petrol price fluctuations which occurred during the week.

Since I heard that, I've been casually checking petrol prices and never really noticed a pattern, till I did some research and found some results from the ACCC (Australian Competition and Consumer Commission) website. 

Here is a chart from the site below: