Perth drivers who filled up on Tuesday caught the cheapest day of the week. Anyone filling up this morning did not.

Everything Perth checked every metropolitan listing on the WA Government's FuelWatch service shortly after 9am on Wednesday 16 September. Across all 451 service stations in Perth postcodes, not one was selling unleaded petrol for less than $2 a litre. The cheapest in the city was 202.5 cents at Vibe Kwinana Town Centre. The dearest was 243.9 cents — and 88 separate stations were charging exactly that.

The story was picked up by WAtoday in its WA news live blog this morning. The FuelWatch data shows how complete the jump is: there is no sub-$2 unleaded anywhere in Western Australia today, metropolitan or regional.

What today actually costs

The middle of the metropolitan market sits at 229.9 cents a litre. The most common single price is 239.9 cents, posted by 111 stations. Only four stations in the whole city are under 205 cents, and only 32 are under 210 cents.

On a 60-litre tank, that spread is real money:

• Cheapest in Perth, 202.5c — $121.50
• Middle of the market, 229.9c — $137.94
• Dearest in Perth, 243.9c — $146.34

The gap between the cheapest and dearest bowser in the same city, on the same morning, is 41.4 cents a litre — $24.84 on one tank.

The cheap end is clustered and it is worth knowing where. The 20 lowest prices this morning were dominated by Vibe and Liberty sites, with the two Costco outlets (Casuarina and Perth Airport, both 202.7 cents) also near the bottom. Kwinana Town Centre, Casuarina, Perth Airport, Wanneroo, Kalamunda, Kwinana Beach, Ascot, Oakford, Forrestfield, Landsdale and Maddington all had stations under 208 cents. Several of the 243.9-cent sites were in Applecross, Alfred Cove, Alkimos and Ascot — which means Ascot had both a sub-208-cent station and a top-of-market one.

Why it happened today, of all days

This is not a surprise so much as a schedule. Consumer Protection's published guidance on the WA petrol price cycle says unleaded in metropolitan Perth and Mandurah currently runs on a seven-day cycle, and the cycle begins with a sharp increase on one day — currently Wednesday.

"The price cycle begins with a sharp increase one day, currently every Wednesday. The prices then decrease over the following six days." — Consumer Protection WA

So Tuesday was the bottom of the cycle, today is the hike, and from tomorrow prices should grind down again until next Tuesday. The cycle applies only to unleaded — diesel and LPG do not follow it, and regional WA prices are generally steadier.

It is worth being clear about what the cycle is not. No government sets the price. Consumer Protection lists the real drivers as international benchmark prices, the Australian dollar against the US dollar, local competition, and the daily pricing decisions of wholesalers and retailers. The Wednesday spike is a retail pattern layered on top of all that, not a separate tax.

How to use the next 24 hours

The WA scheme is unusually useful here, because prices are fixed and published in advance. Retailers must notify FuelWatch of the next day's prices by 2pm, those prices are locked in for 24 hours from 6am the following morning, and FuelWatch makes them public to everyone by 2.30pm.

In practice that means from about 2.30pm today you can see Thursday's prices at every station near you before you drive anywhere — and in a normal cycle Thursday is cheaper than Wednesday. If your tank can wait, waiting is the whole strategy.

One caveat on the numbers above: FuelWatch lists standard cash prices only. They exclude supermarket dockets, loyalty discounts and card surcharges, so what you actually pay can differ from what is posted.

Everything Perth will keep an eye on where the cycle bottoms out next week.

All prices in this article were read from FuelWatch's public station listings at approximately 9am AWST on Wednesday 16 September 2026, covering the 451 metropolitan stations in postcodes 6000–6199.

File photo: a Shell service station on Great Northern Highway in Upper Swan — not one of the stations named above. Photo: Outrune via Wikimedia Commons (CC0).