Why Queensland Diesel Dropped 3.6 Cents While South Australia Crossed the $3 Mark and What Supply Chains Tell Us
Here's what's happening and why it matters. As of 23rd Mar 2026, diesel prices across Australia are moving in completely different directions depending on where you live. Queensland diesel has eased 3.6 cents per litre to an average of 296.5 cents, while South Australia has pushed through the symbolic $3 barrier to sit at 300.4 cents, the most expensive diesel average in the country.
You might be wondering why two neighbouring states can move in opposite directions on the same day. Let me explain.
The key factor here is refinery access
Think of it this way. Queensland has direct access to fuel terminals in Brisbane and Gladstone, with shorter supply lines from Asian refineries through major east coast ports. When global wholesale prices ease, Queensland tends to feel the benefit relatively quickly because the fuel doesn't have to travel far from port to bowser.
South Australia faces a different equation entirely. Adelaide sits at the end of a longer distribution chain. Fuel arrives through Port Adelaide or gets trucked and railed from interstate terminals. That extra handling and transport adds cost at every step, and it also means price drops take longer to filter through. Essentially, SA motorists pay a geography tax that most people don't think about when they're filling up.
The numbers today tell that story clearly. Queensland's 60 reporting stations show an average of 296.5 cents with a tight spread of just 24.2 cents between the cheapest and most expensive. South Australia's 47 stations average 300.4 cents with a spread of 27 cents, from 287.9 to 314.9. That tighter Queensland range tells us competition is working harder there because more servos are clustered in denser corridors.
The reason behind the national diesel picture
Let's break this down step by step across the country. Today's state averages for diesel paint an interesting picture of how supply and demand play out differently in each market.
Northern Territory has the lowest average at 293.5 cents, but don't let that fool you. The Territory also has the widest price spread in the nation at a staggering 251.7 cents. The cheapest diesel in the NT sits at just 147.3 cents while the most expensive reaches 399.0 cents. That gap exists because remote communities like Borroloola and Elliott face enormous freight costs to get fuel delivered along unsealed roads, sometimes hundreds of kilometres from the nearest terminal. Meanwhile, stations closer to Darwin in suburbs like Holtze average a more reasonable 290.9 cents.
This is supply and demand in its purest form. When there's only one servo within a 200 kilometre radius, the pricing power shifts entirely to the seller.
Where the savings are hiding
Victoria offers some of the most competitive diesel pricing right now at 294.9 cents average, thanks to fierce competition across Melbourne's outer suburbs. Drivers around Clayton South can find diesel as low as 189.9 cents, while Deer Park averages 288.4 cents and Werribee sits at 289.6 cents. Regional towns are also competing hard, with Rochester averaging 288.2 cents and Ouyen at 288.3 cents.
In Queensland, the drop from yesterday's 300.1 cent average down to 296.5 cents represents genuine relief for commercial operators and tradies who rely on diesel daily. That 3.6 cent drop on a 70 litre tank saves about $2.52 per fill, which adds up to meaningful money over a working week for anyone running a fleet.
Meanwhile, New South Wales has moved sharply in the other direction, with diesel jumping 15.6 cents to 298.5 cents across 1,079 stations. Fairfield averages 291.2 cents and Granville sits at 290.8 cents for those looking for better value in Sydney's west. Regional NSW also has pockets of value, with Marulan on the Hume Highway averaging 291.2 cents.
Understanding why this matters for your wallet
The lesson from today's numbers is that diesel pricing in Australia isn't one market. It's eight separate markets, each shaped by its own mix of port access, competition density, and transport costs. Queensland and South Australia sit just 200 kilometres apart at their closest point, yet their diesel markets behave like different countries.
For South Australian motorists watching prices push past that $3 per litre mark, the economics suggest patience. When wholesale prices drop, as they appear to be doing for Queensland right now, Adelaide typically follows within three to five days. The lag is frustrating but predictable, and understanding that pattern helps you plan when to fill up rather than reacting to the price on the board today.
Understanding these patterns helps you predict where prices are heading next and plan accordingly.
