What a price cycle is
In several Australian capital cities, petrol prices move in a repeating pattern called a price cycle. Prices climb sharply over a day or two — the "restore" — then drift down gradually over the following days or weeks until they hit a low, and the cycle repeats. These cycles are driven by retailer pricing behaviour, not by the underlying wholesale cost, which moves far more smoothly.
The important consequence is that on any given day the same fuel can cost very different amounts depending on where the city is in its cycle. Buying at the top of a restore versus the bottom of the trough can differ by 30 to 50 cents a litre — real money on a full tank.
Cycles differ by city
There is no national cycle. Each city runs on its own rhythm, and the length varies. Some cities cycle over roughly a week or so; others run longer, stretching to several weeks between troughs. The timing also drifts over the year, so a cycle that peaked on a Tuesday for months can move.
Smaller cities and regional areas often do not have clear cycles at all — prices there tend to move more slowly and track wholesale costs more directly. So the strategy that works in a large capital does not necessarily apply where you are, which is why watching your own city's prices beats following a rule of thumb.
- Restore
- The sharp, sudden jump in retail petrol prices that starts a new cycle, often 30 to 50 cents a litre over a day or two.
- Trough
- The bottom of the cycle, where prices are lowest and the best time to fill up before the next restore.
- Cycle length
- The time from one trough to the next. It varies by city and drifts over the year, so it is not a fixed calendar rule.
How to time your fill-ups
- Watch your city's prices over a few weeks using a live price map so you learn its current rhythm.
- Fill up when prices are near the trough — flat and low — rather than after a sudden jump.
- Avoid buying on the day of a restore; if you can wait, prices will start drifting down again.
- Keep enough fuel in the tank that you are never forced to buy at the top out of necessity.
- When you spot a trough, do a full fill rather than a partial one to make the low price count.
Let the data do the watching
Tracking a cycle by memory is hard, especially when the timing drifts. Live price data makes it easy: in NSW and WA, stations report prices in real time, and EnergySorted's live fuel map shows current prices near you so you can see at a glance whether the city is high or low right now.
The goal is not to obsess over saving every last cent but to avoid the obvious mistake — filling a full tank at the peak of a restore when a day or two of patience would have saved you a chunk. Check the map before you commit, and buy near the bottom when you can.