Western Australia fuel prices, October 2026 so far

1. Perth reported prices averaged 234.2 c/L for U91 in October 2026, up 14.1 c/L on September 2026.

2. Pinjarra was the cheapest town in Mandurah for U91 in October 2026 at 231.0 c/L, 3.2 c/L below Perth.

3. Bunbury averaged 235.3 c/L for U91 in October 2026, 1.1 c/L above Perth, and was cheaper than Perth in 1 of 7 months since our records began on 13 April 2026.

4. Since our records began on 13 April 2026, Tuesday has been the cheapest day to buy U91 in Perth and Wednesday the dearest, 12.6 c/L apart on average: $7.56 on a 60-litre tank.

5. Filling a 60-litre tank with U91 in Oakford (rural) rather than in Drysdale River (rural) saved $81.18 on average in October 2026.

6. Independent service stations in Western Australia averaged 2.4 c/L more than the major brands for U91 in October 2026, and 7.0 c/L less in Perth.

7. Diesel cost 36.4 c/L more than U91 in Perth in October 2026, down from 42.8 c/L in September 2026.

8. Oakford (rural) was Western Australia’s cheapest town for U91 in October 2026 at 222.9 c/L, 11.3 c/L below Perth.

1. Perth reported prices averaged 234.2 c/L for U91 in October 2026, up 14.1 c/L on September 2026.

2. Diesel reported prices in Perth averaged 270.6 c/L in October 2026, up 7.7 c/L on September 2026.

3. Since our records began on 13 April 2026, Perth's highest daily U91 average was 245.7 c/L on 14 October 2026 and its lowest 147.9 c/L on 30 June 2026. The high was set in October 2026.

4. Perth's daily U91 average went from 236.4 c/L on 1 October to 231.8 c/L on 29 October, and diesel from 274.9 c/L to 270.5 c/L.

5. The highest daily average in Perth was 245.7 c/L for U91 on 14 October and 274.9 c/L for diesel on 1 October.

6. Since 1 July 2026 in Perth: U91 up 67.7 c/L, diesel up 93.5 c/L, P95 up 68.2 c/L, P98 up 68.4 c/L and LPG up 3.2 c/L.

7. Perth ranked second cheapest of the 8 capital cities for U91; Adelaide was the cheapest at 233.5 c/L and Hobart the dearest at 247.4 c/L.

8. On 29 common dates in October 2026, Perth's U91 daily averages had a mean of 234.2 c/L, against 229.2 c/L at the Perth terminal: a gross spread of 5.0 c/L. Each date counts equally; this is not the station-day-weighted headline mean or a profit estimate.

9. The Perth terminal gate price averaged 229.2 c/L for unleaded and 254.9 c/L for diesel, up 14.4 c/L and up 4.7 c/L on September 2026.

10. Wholesale unleaded averaged 229.2 c/L at the Perth terminal, a record: the dearest wholesale month since AIP's series began in January 2004 (the previous high was September 2026 at 214.8 c/L); the cheapest of the last ten years was April 2020 at 82.0 c/L.

11. Perth's U91 price cycle ran in October 2026: four hikes lifted the margin over the terminal gate price by 13.0 c/L on average, with peaks about 7.0 days apart.

12. The cheapest U91 outside Perth was in Oakford (rural), at 222.9 c/L, 11.3 c/L below Perth.

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Cents a litre. Change is on September 2026. Difference is the rest of the state against Perth.

Cents a litre. Each month is the station-day average of the days it has in the period. An area’s months count the same stations as its month.

Cents a litre. Each month is the station-day average of the days it has in the period. An area’s months count the same stations as its month.

Each common date counts once. Retail is the mean of the saved daily capital averages, not the station-day-weighted headline mean. TGP uses the same dates and carries the last published value for at most six subsequent calendar days. Retail prices can already include carried station prices. Means and spreads are rounded separately. The gross spread is not profit or a causal explanation. Retail carry limit: 30 days. Unmatched dates are excluded; common days are not a station or sales coverage percentage.

Worked out the same way as the table above.

Perth’s daily U91 average less the Perth terminal gate price is the indicative margin, not profit. A hike requires this margin and the retail average each to rise by at least 8.0 c/L within 5 days. Where station-rise counts are available, daily rises of at least 5.0 c/L, summed over the rise, must reach 25% of the station count at the peak; a station can count on more than one day. Rises within 3 days of an excise change are excluded. The margin must then ease by at least half within 21 days; if follow-up is too short, a counted hike can have unconfirmed easing. A regular cycle requires at least two detected hikes. No detected hike does not establish why retail prices changed.

Excise is charged on fuel as it leaves the terminal, so it is already in the terminal gate price; GST is then charged on top.

Source: ATO: Excise duty rates for fuel and petroleum products

Cents a litre, cheapest first. Each capital is its ABS urban area, worked out exactly as in its own state’s report. The margin is against its own terminal’s gate price (Canberra uses Sydney’s). Period-average margins are omitted here: comparable daily inputs and weights are not retained for these rows.

Cents a litre, cheapest first. Each capital is its ABS urban area, worked out exactly as in its own state’s report. The margin is against its own terminal’s gate price (Canberra uses Sydney’s). Period-average margins are omitted here: comparable daily inputs and weights are not retained for these rows.

Cents a litre, cheapest U91 first. Areas are the ABS Statistical Areas Level 4 (SA4) inside Perth’s urban area, named in plain words (“Brisbane - East” is Brisbane East). An area counts its stations that reported on at least a quarter of the days; its average, station count and cheapest station all come from them. Period-average margins are omitted here: comparable daily inputs and weights are not retained for these rows.

Cents a litre, cheapest first. Perth’s U91 average was 234.2 c/L. A town’s margin is against Perth’s terminal gate price. Period-average margins are omitted here: comparable daily inputs and weights are not retained for these rows.

Cents a litre, cheapest first. A town is ranked with at least two stations reporting through the period and a price on most days; 195 smaller places were left out. The cheapest station’s figure is its own average over the period.

Cents a litre, cheapest first. A town is ranked with at least two stations reporting through the period and a price on most days; 192 smaller places were left out. The cheapest station’s figure is its own average over the period.

Fewer stations sell these fuels, so fewer towns are ranked.

Cents a litre, cheapest first. A regional centre is a large regional city we map on its own, or an ABS urban centre of 10,000 people or more (2021 Census) outside Perth.

Cents a litre; negative is cheaper than Perth. The areas are Perth’s ABS SA4 areas and the regional centres of 50,000 people or more.

A suburb or town is the ABS locality a station sits in, ranked within its SA4 by the same rule as the towns.

5 of the 83 towns we ranked averaged less than Perth for U91.

Each day’s average against the seven days centred on it, averaged by weekday, so a steady rise or fall does not favour one end of the week. A place needs four of each weekday with prices from five stations or more; a month usually shows the year so far only.

The major brands are 7-Eleven, Ampol, BP, Caltex, EG, Mobil, On The Run (OTR), Reddy Express, Shell and United; every other brand, and a station without one, is independent. Stations with a price on a quarter of the days; a brand is listed with five or more.