Forrestfield Diesel Falls Below 197 Cents While Western Australia Sheds 34 Cents and Queensland Lifts on the Same Morning

Forrestfield Diesel Falls Below 197 Cents While Western Australia Sheds 34 Cents and Queensland Lifts on the Same Morning

Tuesday's price feeds have uncovered one of the most lopsided diesel mornings of the year. Western Australia shed 34.2 cents per litre overnight to an average of 243.5 cents, yet Queensland climbed 9.1 cents to 246.7 cents and South Australia added 8.0 cents to 247.0 cents on the same 12th May 2026 8:08am AEST readings. The variation between regions on a single morning is striking and worth investigating.

A closer look at the WA data reveals where the relief is concentrated. Forrestfield servos are pumping diesel at a low of 196.9 cents with a five station average of 205.5 cents. That is the cheapest diesel suburb in the entire country this morning. Bassendean follows close behind with a low of 197.3 cents, Ascot at 197.9 cents, and Kwinana Beach at 198.9 cents. Port Kennedy rounds out the below 200 cent club at 199.7 cents.

Five WA suburbs with diesel below 200 cents while New South Wales motorists pay an average of 244.0 cents and Northern Territory drivers cop 300.9 cents per litre. That is a 100 cent gap between the cheapest WA bowsers and the NT average, raising serious questions about diesel pricing transparency across the country.

Digging Deeper Into the Numbers

The 34.2 cent overnight drop in WA represents a 12.3 per cent fall in a single 24 hour window. Across 1,118 stations, that scale of movement is rarely organic. Wholesale diesel rack rates have not moved enough to justify a one day correction of that magnitude, which means motorists are watching official price boards finally catch up to what community verified data has been showing for days.

Meanwhile, the picture in Queensland tells the opposite story. The state average climbed 9.1 cents on the same morning, with Dalby lifting 13.6 cents to 249.4 cents per litre across nine local servos. That is a 23 cent swing in opposite directions between two states with similar refining and supply chains. A closer look at SA suggests the same pattern, with the Barossa Council region recording a 21 cent overnight increase on unleaded petrol that landed pumps at 207.9 cents.

Where Perth Drivers Are Winning

Perth metro suburbs dominate today's cheapest diesel rankings, occupying 18 of the top 20 positions. Beyond the leaders below 200 cents, motorists in Neerabup at 209.9 cents, Beckenham at 199.3 cents and Yangebup at 209.9 cents all have access to pricing well below the WA state average.

The spread within these suburbs is also worth scrutinising. Forrestfield shows a 16 cent gap between its cheapest pump at 196.9 cents and its most expensive at 212.9 cents. Drivers filling a 60 litre tank at the wrong end of that suburb are paying around $9.60 more for exactly the same fuel. Ascot has an even wider 36 cent spread, while Bassendean carries 38.6 cents between its cheapest and dearest servos. Loyalty to a single brand can quietly cost motorists hundreds of dollars per year when the competition next door is undercutting by 15 cents or more.

A Closer Look Reveals the Pattern

Tuesday's data uncovers a clear two speed market. Western states are cycling down, eastern and southern states are cycling up, and the regulators in Queensland and South Australia have some explaining to do about why their motorists are paying more on the morning that 1,118 WA stations dropped their boards. The optics of synchronised increases in two separate states on the same day deserve closer scrutiny.

For Perth drivers, the message is straightforward. Tank up now while the metro market sits below 200 cents. For drivers in New South Wales, Victoria and Queensland, the rises in QLD and SA suggest the eastern cycle has bottomed and a rebound is already underway. Use the savings calculator to work out which side of the cycle you are on before your next fill, and keep an eye on the best time to fill up guide so you are not the motorist paying the post rebound rate.

Armed with this information, motorists can make informed decisions and avoid paying more than necessary at a time when interstate diesel divergence is the widest it has been all year.