Goulburn Diesel Falls to 207 Cents While New South Wales Sheds 5 Cents and the Hume Highway Becomes the State's Cheapest Corridor
Looking at the data from the past 24 hours, Goulburn diesel has dropped to 207.9 cents per litre at its cheapest station, while New South Wales as a whole has shed 5.4 cents from its diesel average. The numbers tell an interesting story about where freight operators and motorists are finding the best value, and the answer is increasingly along the Hume Highway south of Sydney rather than the metro itself.
NSW Diesel Sheds 5 Cents Overnight
As of 13th May 2026 2:01pm AEST, the state diesel average across 1,142 monitored NSW stations sits at 239.5 cents per litre, down from 244.9 cents yesterday. That is a substantial single day movement representing a 2.2 per cent decline.
The spread between the cheapest and most expensive NSW diesel station remains enormous at 150.2 cents. At the bottom, Greenacre in Sydney's western suburbs continues to hold the state's cheapest diesel prices at 199.7 cents. At the top, isolated stations are still asking up to 349.9 cents, which speaks to how widely fuel pricing varies across regional NSW.
The Hume Highway Corridor Emerges
The data indicates a notable pattern along the M31 Hume Highway south of Sydney. Two regional centres along this freight artery are now offering some of the cheapest diesel in the state:
- Goulburn: cheapest station at 207.9 cents, average 222.2 cents across 7 stations
- Marulan: cheapest station at 209.9 cents, average 222.2 cents across 4 stations
Further north, Mayfield in Newcastle offers a similar regional discount with diesel from 218.9 cents across three stations, well below the Sydney CBD average.
For context, the Sydney metropolitan diesel average is sitting roughly 7 to 10 cents above the Hume Highway corridor pricing. A closer analysis reveals that for a freight operator running a 400 litre tank from Sydney to Canberra and back, the price differential at Goulburn versus the Sydney CBD works out to roughly $30 to $40 in fuel savings per trip.
Worth noting is that Marulan, with its concentration of truck stops servicing the Hume Highway corridor, has held below the state average for an extended period. The 22 cent spread within the suburb tells motorists to check pricing before committing to a particular servo.
Western Sydney Still Holds Outright Value
While the Hume corridor offers the best value for southbound travellers, Sydney's western suburbs continue to dominate the outright cheapest pricing in the state. The numbers:
- Greenacre: 199.7 cents (cheapest in NSW)
- Smithfield: 214.5 cents (average 219.6 across 3 stations)
- Port Kembla: 216.9 cents (Illawarra coastline)
This represents a notable shift from earlier in the cycle when regional stations were holding closer to metro pricing. Statistically speaking, motorists in Greenacre are now paying around 17 per cent less for diesel than the NSW state average, which is a substantial discount worth driving for if you live nearby.
Why the Spread Matters
The 150 cent spread within NSW alone is one of the largest in the country. By comparison, Queensland shows a 139 cent spread, South Australia just 119 cents, and the Australian Capital Territory only 30 cents. The reasons are largely structural: NSW combines dense metro competition with isolated regional pricing where there may be only one or two diesel suppliers within 100 kilometres.
For motorists, this means the savings calculator becomes genuinely useful. The difference between filling up at Greenacre versus a remote NSW station could be over $90 on a single 60 litre fill.
What to Watch in the Coming Days
A few patterns worth tracking through the week:
- Whether the 5.4 cent decline continues: Yesterday's 244.9 cent average came on the back of seven days of gains. A continued slide would suggest the state has moved past its recent peak.
- Hume corridor stability: If Goulburn and Marulan hold their floor below 210 cents, freight operators will continue to shift their refuelling stops southward.
- Western Sydney competition: Greenacre at 199.7 cents is approaching a psychological threshold. If that floor below 200 cents breaks across multiple suburbs, expect significant volume shifts in the metro market.
The numbers are clear: NSW motorists who time their fill ups strategically along the Hume corridor or in the western suburbs could save substantially over the next 48 to 72 hours. The pattern of cheaper regional diesel along major freight routes is unusual and worth acting on while it lasts.
