this post was submitted on 28 Mar 2026
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Why does Perth have price hikes every week ?
Wait, the rest of the country doesn't have a fuel cycle?? Huh.
Pro: you can reliably get "cheap" fuel on a Tuesday.
Con: Everyone gets fuel on Tuesdays, and you will sit in traffic to fuel up. And if you run out of fuel on a Wednesday or Thursday, you're gonna be (even more) broke.
This was the case in Melbourne too, when I was working at a service station back in my Uni days.
Not sure when things changed, but apparently it moved to a fortnightly cycle at some point, before completely losing any semblance of predictability post-COVID.
I'm pretty sure Shell and Ampol are the main culprits. Other stations don't seem shift as dramatically.
Other cities do, they just don't show on this graph. You can normally track them on the ACCC's website. Perth having a cycle isn't unusual, but it is unusually short and extremely consistent compared to those of other cities.
ABC News Daily hosted David Byrne, professor of economics, who talked about this.
He didn't go into a lot of detail but basically, it's because fuel watch allows retailers to monitor each other's prices.
Basically, fuel retailers can always increase their margins by fluctuating their prices. Cheap today more expensive tomorrow.
When Fuel Watch was introduced (only exists in WA), you couldn't just fluctuate your prices irrespective of what everyone else was doing because if your price was significantly higher than everyone elses you wouldn't have any customers. So retailers had to fluctuate their prices in concert with other retailers.
Finally, if every retailer is going to have a high point and a low point each week, it feels sensible that right before the weekend would be the highpoint, because that's when everyone is gearing up for their weekend plans. Then high over the weekend when people are doing things, high on Monday when everyone is back from a weekend away, then cheap fuel Tuesday to gather up some customers, and so on.
I swear that began when fuel watch was implemented.
None the less I like the fuel watch system. Before that it was a clown show.