When is fuel cheapest in Australia?

Published on 2026-09-22

In most countries the honest answer is "it barely matters". In Australia it matters enormously — because the capital cities run a price cycle, and filling up on the wrong morning can cost you 40 cents a litre.

The cycle beats everything else

In Sydney, Melbourne, Brisbane, Adelaide and Perth the retail price does not drift up and down with crude. It falls gradually for one to three weeks as retailers undercut each other, then snaps back in a single morning when they all restore margin at once.

That restoration is usually 30 to 50 cents a litre. No brand choice, no loyalty card and no discount docket comes close to that. If you only change one habit, make it this one: fill up in the back half of the cycle, not the day the jump lands.

Western Australia is the exception, and it is in your favour

WA has no cycle, because FuelWatch requires stations to publish tomorrow's price by 2:30 pm today and then locks it for 24 hours. That means the price you see in the afternoon is the price you will pay tomorrow.

So in Perth the question is not "which day" but "before or after 6 am tomorrow". If a rise is published, you have the rest of today to beat it.

Time of day is a rounding error

Outside the cycle, the same servo rarely moves much within a day. The gap between two servos on the same road, on the same morning, is far bigger than the gap between 7 am and 7 pm at either of them.

Put differently: drive an extra kilometre rather than wait three hours.

Check before you drive, not at the bowser

Every mainland state except the Northern Territory requires stations to report their prices, so the number is knowable before you leave. NSW, Queensland and South Australia report changes within about half an hour; Victoria's scheme runs a day behind by design.

Refil reads those schemes and shows the cheapest servo for your fuel in green. Ten seconds of looking usually saves more than a quarter of an hour of driving.

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