Territory Diesel Falls 46 Cents in a Day While NT Pumps Span the Nation's Widest Price Gap

The number that caught my eye this morning is 46.2 cents. That is how far the average diesel price across the Northern Territory fell overnight, sliding from 319.0 to 272.8 cents per litre across 179 monitored stations. As of 8:07am AEST on 28th Jul 2026 it is the largest diesel move in the country, a 14.5 per cent decline in a single reading, and it did not come from a capital city price war. A move that size deserves a closer look.

A big fall, an even bigger spread

Even after a decline of that size, the Territory still carries the most expensive average diesel prices in Australia. The next highest is the ACT at 235.6, with every other state sitting between 229.9 and 234.2.

The spread is what makes the NT unusual. Territory diesel currently runs from 187.9 at the cheapest pump to 432.0 at the most expensive, a gap of 244.1 cents and comfortably the widest in the nation. Western Australia has the second widest spread at 198.0 cents, while Canberra motorists are looking at a band of just 10 cents across all 23 of the capital's diesel pumps.

That 187.9 floor is the part I keep coming back to. The cheapest diesel in the Territory now undercuts the best available price in Queensland (202.9), South Australia (200.4), Tasmania (199.9) and WA (192.0). Only Victoria at 183.9 and NSW at 187.0 go lower. The Territory holds some of the cheapest diesel in the country and by far the dearest at the same time, which tells you a lot about why a state average on its own can mislead.

Why Territory motorists should check first and drive second

The NT has one structural advantage for price hunters: servos lock their prices in for a full 24 hours. A price you see on the Petrolmate map at breakfast is the price you will pay in the afternoon. Our guide to how the NT 24 hour price lock works covers the detail, but the practical takeaway is simple. With a 244 cent spread across the Territory, Darwin drivers and remote travellers get more value from a 30 second price check than motorists anywhere else in Australia.

The rest of the country is unusually tight

The other pattern in this morning's data is how closely the states have bunched. NSW sits at 232.9, South Australia at 233.1, Queensland at 233.2 and WA at 234.2. Four states within 1.3 cents of each other is about as uniform as national diesel pricing gets.

Victoria remains the cheapest state for diesel at an average of 229.9 and also holds the single cheapest pump in the country at 183.9. Tasmania lifted to 232.1, a substantial move from the unusually low 184.9 recorded a day earlier, and consistent with the broader diesel lift I flagged across the state earlier this month.

Deniliquin leads the suburb movers

At the suburb level, the lifts outweighed the falls this morning:

The decreases were smaller but still worth real money to anyone filling a large tank:

What the numbers mean for your next fill

Three things follow from the data.

  1. If you run diesel in the Territory, never rely on the average. The 244 cent spread means the station you choose matters more there than anywhere else in the country.
  2. The 24 hour price lock means a morning check is binding, so the savings are bankable rather than hopeful. Check before you drive, not after.
  3. For east coast drivers the market is unusually flat this week, so timing matters less than simply picking the cheapest pump in your own suburb.

    4. The numbers are clear: a 46 cent state average move in one day is rare, and the Territory is finally heading in the right direction for diesel drivers. With pumps running from 187.9 to 432.0, though, the gap between a good decision and a poor one has never been wider.