What affects fuel prices
Retail fuel prices in Australia are largely determined by:
- global factors influencing international crude oil and refined fuel prices
- the value of the Australian-US dollar exchange rate.
Local factors, such as the level of competition can also affect retail prices.
Learn more about what affects fuel prices.
Petrol price cycles
Petrol prices move up and down in regular patterns in Australia's 5 largest cities. Prices can increase sharply over a short period, then decrease gradually over a longer period before the process repeats.
This pattern is also known as a petrol price cycle.
Petrol price cycles are the result of pricing decisions made by various petrol retailers. They are not driven by movements in wholesale prices or underlying costs. Not all retailers participate in price cycles.
How long petrol price cycles last in each city
The duration of petrol price cycles in Sydney, Melbourne, Brisbane, Adelaide and Perth varies between city and over time.
In 2024, the average duration of petrol price cycles was around:
- 5 and a half weeks in Sydney
- 6 and a half weeks in Melbourne
- 6 weeks in Brisbane
- 2 and a half weeks in Adelaide
- 1 week in Perth.
Petrol buying tips and charts
You can use petrol price cycles to help you decide when to buy petrol in Sydney, Melbourne, Brisbane, Adelaide and Perth. For these cities, we update:
- buying tips on weekdays (at least Monday, Wednesday and Friday) around midday
- historical data on price cycles as necessary.
You should use this information as a guide only. The duration of each petrol price cycle varies from cycle to cycle and by location. Historical data can only indicate or suggest the cheapest and most expensive days to buy petrol in the future.
Buying tip (updated on Monday):
- Prices are increasing.
- If motorists shop around, they may find some retailers that have not yet increased prices.
This chart shows daily average regular unleaded petrol prices in Sydney over the past 45 days.
Source: Informed Sources.
Information on the past 5 price cycles in Sydney is shown in this table:
| First day of cycle (low price) |
No. of days to highest price in the cycle |
Date of highest price in the cycle |
Days to next cycle (next low price) |
Total days in cycle |
| Tue 15 Apr 25 |
15 |
Wed 30 Apr 25 |
22 |
37 |
| Thu 22 May 25 |
18 |
Mon 09 Jun 25 |
13 |
31 |
| Sun 22 Jun 25 |
16 |
Tue 08 Jul 25 |
19 |
35 |
| Sun 27 Jul 25 |
10 |
Wed 06 Aug 25 |
23 |
33 |
| Fri 29 Aug 25 |
14 |
Fri 12 Sep 25 |
21 |
35 |
Source: ACCC calculations based on data from Informed Sources.
Buying tip (updated on Monday):
- Prices are decreasing and may decrease further.
- Motorists looking to buy petrol can shop around for the lowest prices.
This chart shows daily average regular unleaded petrol prices in Melbourne over the past 45 days.
Source: Informed Sources.
Information on the past 5 price cycles in Melbourne is shown in this table:
| First day of cycle (low price) |
No. of days to highest price in the cycle |
Date of highest price in the cycle |
Days to next cycle (next low price) |
Total days in cycle |
| Tue 25 Mar 25 |
21 |
Tue 15 Apr 25 |
35 |
56 |
| Tue 20 May 25 |
14 |
Tue 03 Jun 25 |
20 |
34 |
| Mon 23 Jun 25 |
14 |
Mon 07 Jul 25 |
25 |
39 |
| Fri 01 Aug 25 |
13 |
Thu 14 Aug 25 |
24 |
37 |
| Sun 07 Sep 25 |
15 |
Mon 22 Sep 25 |
25 |
40 |
Source: ACCC calculations based on data from Informed Sources.
Buying tip (updated on Monday):
- Prices are decreasing and may decrease further.
- Motorists looking to buy petrol can shop around for the lowest prices.
This chart shows daily average regular unleaded petrol prices in Brisbane over the past 45 days.
Source: Informed Sources.
Information on the past 5 price cycles in Brisbane is shown in this table:
| First day of cycle (low price) |
No. of days to highest price in the cycle |
Date of highest price in the cycle |
Days to next cycle (next low price) |
Total days in cycle |
| Tue 28 Jan 25 |
22 |
Wed 19 Feb 25 |
74 |
96 |
| Sun 04 May 25 |
21 |
Sun 25 May 25 |
23 |
44 |
| Tue 17 Jun 25 |
20 |
Mon 07 Jul 25 |
27 |
47 |
| Sun 03 Aug 25 |
12 |
Fri 15 Aug 25 |
25 |
37 |
| Tue 09 Sep 25 |
12 |
Sun 21 Sep 25 |
24 |
36 |
Source: ACCC calculations based on data from Informed Sources.
Buying tip (updated on Monday):
- Prices are decreasing and may decrease further.
- Motorists looking to buy petrol can shop around for the lowest prices.
This chart shows daily average regular unleaded petrol prices in Adelaide over the past 45 days.
Source: Informed Sources.
Information on the past 5 price cycles in Adelaide is shown in this table:
| First day of the cycle (low price) |
No. of days to highest price in the cycle |
Date of highest price in the cycle |
Days to next cycle (next low price) |
Total days in cycle |
| Thu 31 Jul 25 |
5 |
Tue 05 Aug 25 |
12 |
17 |
| Sun 17 Aug 25 |
8 |
Mon 25 Aug 25 |
4 |
12 |
| Fri 29 Aug 25 |
7 |
Fri 05 Sep 25 |
13 |
20 |
| Thu 18 Sep 25 |
8 |
Fri 26 Sep 25 |
8 |
16 |
| Sat 04 Oct 25 |
8 |
Sun 12 Oct 25 |
4 |
12 |
Source: ACCC calculations based on data from Informed Sources.
Buying tip (updated on Monday):
- Prices appear to be around the lowest point of the cycle.
- Now is a good time for motorists to buy petrol.
This chart shows daily average regular unleaded petrol prices in Perth over the past 45 days.
Source: Informed Sources.
Information on the past 5 price cycles in Perth is shown in this table:
|
First day of cycle (low price)
|
No. of days to highest price in the cycle
|
Date of highest price in the cycle
|
Days to next cycle (next low price)
|
Total days in cycle
|
| Tue 23 Sep 25 |
1 |
Wed 24 Sep 25 |
6 |
7 |
| Tue 30 Sep 25 |
1 |
Wed 01 Oct 25 |
6 |
7 |
| Tue 07 Oct 25 |
1 |
Wed 08 Oct 25 |
6 |
7 |
| Tue 14 Oct 25 |
1 |
Wed 15 Oct 25 |
6 |
7 |
| Tue 21 Oct 25 |
1 |
Wed 22 Oct 25 |
6 |
7 |
Source: ACCC calculations based on data from Informed Sources.
Monitoring fuel prices following the excise cut and restoration
The ACCC closely monitored fuel prices following the Federal Budget reduction in fuel excise from 30 March to 28 September 2022. Results of our monitoring were described in the March 2022, June 2022 and September 2022 quarterly petrol reports.
