Fuel guide
How Long Is the Petrol Price Cycle? (2026)
Recent petrol price-cycle lengths for Sydney, Melbourne, Brisbane, Adelaide and Perth, with current ACCC guidance on how to use them.
Key points
Key takeaways
Cycle duration varies by city and from one cycle to the next.
In 2025 the average was about five weeks in Sydney, six in Melbourne and six and a half in Brisbane.
Adelaide averaged about two and a half weeks in 2025; Perth averaged one week.
ACCC cycle guidance covers unleaded petrol in the five largest cities, not diesel, LPG or most regional areas.
Using this guide
Before you act on the guide
Check the station price, report time and distance before changing your route.
There is no single cycle length
Petrol price cycles differ by city and change over time. A cycle runs from one low point through a price rise and the following fall to the next low point. It is a retail pricing pattern, not a timetable set by wholesale fuel costs.
Recent cycle lengths by city
| City | Average duration in 2025 | What the number means |
|---|---|---|
| Sydney | About 5 weeks | An average only; the next cycle may be shorter or longer. |
| Melbourne | About 6 weeks | Use the current chart rather than a weekly rule. |
| Brisbane | About 6.5 weeks | The cycle does not stay tied to one weekday. |
| Adelaide | About 2.5 weeks | Check whether the current market is rising or easing. |
| Perth | About 1 week | FuelWatch also publishes tomorrow's notified prices. |
Why the duration changes
Retailers do not all raise or lower prices at the same time. Local competition, the size of a price reset and retailer decisions can shorten or extend a cycle. Major supply or market disruptions can also make recent historical patterns less useful.
Which fuels and places have cycles?
The ACCC publishes buying tips for regular unleaded petrol in Sydney, Melbourne, Brisbane, Adelaide and Perth. Similar timing can apply to E10 and premium unleaded. Diesel and automotive LPG do not follow these cycles. The ACCC does not publish cycle buying tips for Canberra, Hobart, Darwin or most regional locations.
How to use the duration
Treat the historical duration as background. Check the current cycle position, then compare reported prices at nearby stations for the exact fuel grade your vehicle uses. If prices have started rising, compare stations because some retailers may not have moved yet. If the market is easing, check again closer to the time you need fuel.
Source
The cycle lengths above are from the ACCC petrol price-cycle guidance. Western Australian drivers can use FuelWatch to compare today and tomorrow prices. Source details last checked 8 July 2026.