South Australia Diesel Prices Buck National Trend With 2.3 Cent Increase While Other States Fall

South Australia Diesel Prices Buck National Trend With 2.3 Cent Increase While Other States Fall

A comprehensive analysis of this week's fuel pricing data reveals that South Australia is moving in the opposite direction to the rest of the nation, with diesel prices climbing 2.3 cents overnight to an average of 202.0 cents per litre while every other mainland state recorded modest decreases.

According to the latest data collected on 9th December 2025, South Australian motorists are now paying approximately 10 to 13 cents more per litre for diesel compared to drivers in Victoria, Western Australia, and New South Wales. This price divergence is particularly notable given that wholesale diesel costs have remained relatively stable across the country.

Breaking Down the Numbers

The data paints a clear picture of regional disparities. While SA diesel climbed 1.15 per cent overnight, NSW diesel fell 2.1 cents (down 1.08 per cent) to average 191.7 cents per litre. Queensland diesel dropped a cent to 212.0 cents, and Victoria edged down half a cent to 189.6 cents per litre.

Western Australia continues to offer some of the most competitive diesel pricing in the country, averaging 188.9 cents per litre with a slight 0.6 cent decrease from the previous day.

Drilling down into the specifics, South Australia's price spread of just 46 cents between its cheapest and most expensive stations is actually the tightest of any major state. This compares to a staggering 104 cent spread in NSW and an 83.5 cent spread in Victoria. While this consistency might seem positive at first glance, the data suggests it reflects a market where competition is less aggressive in driving prices down to match the cheapest operators.

Where Adelaide Motorists Can Find Relief

For Adelaide drivers seeking the best diesel prices, the hunt requires venturing beyond the CBD. Historical data suggests that servos along major transport corridors and industrial areas typically offer more competitive rates, though specific suburb data for SA was limited in today's snapshot.

The picture is notably different in other states. In Victoria, suburbs like Moe in Gippsland are offering diesel as low as 166.5 cents per litre, a full 35 cents below the SA average. Epsom near Bendigo is showing prices from 168.1 cents, while Corio near Geelong averages just 181.5 cents across eight stations.

In NSW, Fairfield and Granville continue to deliver competitive diesel prices, averaging 175.1 cents and 176.4 cents respectively. Auburn motorists can find diesel from 175.3 cents per litre.

The Unleaded Picture Tells a Different Story

While diesel dominates today's analysis, unleaded petrol prices show some dramatic movements in Sydney's outer suburbs. Penrith has experienced a significant 36.5 cent jump in unleaded prices overnight, with the average climbing from 179.4 cents to 215.9 cents per litre. This pattern is consistent with Sydney's well documented fuel price cycle hitting its peak phase.

Conversely, Casula in Sydney's southwest recorded a notable 29.6 cent drop in unleaded petrol, with prices falling from 191.8 cents to 162.2 cents per litre. Liverpool also saw unleaded drop 20 cents to 166.9 cents per litre. These suburbs represent the trough of the cycle, offering savvy motorists a brief window of savings.

What's Driving the SA Divergence?

Industry factors suggest South Australia's relative isolation from major refining and distribution hubs can create lag effects in price movements. When wholesale prices fall, SA stations may take longer to pass on savings compared to the more competitive eastern seaboard markets.

The state's smaller population and fewer major retail chains may also reduce the competitive pressure that drives aggressive discounting in Melbourne and Sydney suburbs.

The Bottom Line for Motorists

For motorists willing to shop around, the data clearly demonstrates that location and timing remain the two most important factors in fuel savings. South Australian drivers filling a 60 litre tank with diesel are currently paying approximately $6 to $8 more than their counterparts in Melbourne's outer suburbs or Sydney's western corridor.

NSW drivers should monitor the fuel cycle closely. Those in the trough suburbs like Casula and Liverpool should consider filling up now, while Penrith and Campbelltown motorists may want to wait for prices to cycle back down.

For the most accurate and up to date pricing in your area, check the interactive fuel map which displays real time prices from over 10,000 stations across Australia.