Energy news and the bowser: what's really driving Australian fuel prices today

Published on 2026-09-28

Between talk of retailers reviving an "unfair" price cycle, fresh explainers on fuel excise and an ACCC green light for the majors to coordinate supply, there's plenty of noise around the bowser this week. Here's what actually matters for what you pay per litre today, 28 September 2026.

The price cycle, not the crude, is what bites in a single morning

The headline most drivers feel in their hip pocket is the capital-city price cycle. Prices drift down for one to three weeks, then jump 30 to 50 cents in a single morning. That leap is a retail margin decision, not a barrel of oil moving overnight — which is exactly why motoring bodies like the RACQ have been accusing some retailers of trying to reinstate a cycle that many drivers thought had faded, and why others are urging drivers to fill up while a discount streak lasts.

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Crude and refined product costs do matter, but they reach the bowser with a lag of roughly one to two weeks, filtered through fuel excise, freight and local competition. So when you see coverage of conflict-driven spikes and accusations of price gouging during the Iran war, treat it as pressure on the trend rather than a promise about tomorrow's board price.

Western Australia remains the outlier worth envying: FuelWatch publishes tomorrow's price at 2:30pm and it's locked in for 24 hours, so there's no guessing whether you're on the up-swing or the down-swing.

Today's numbers: the gap between servos is the real saving

Refil's own AU data for 28 September 2026 shows how much the servo you choose matters. Unleaded 91 ranges from $2.265/L at the cheapest site to $2.680/L at the dearest, with an average of $2.390/L. That's a spread of $0.415/L — about $20.75 on a 50-litre fill, for the same fuel.

Diesel is tighter at the bottom end but wider overall: $2.655/L cheapest, $3.107/L dearest, $2.870/L average, a $0.452/L gap or roughly $22.60 per 50-litre tank. Diesel sitting above petrol isn't a glitch; it reflects global demand from freight, mining and agriculture plus different refining and supply economics, a point the recent "why is diesel dearer?" explainers make well.

E10 is the calmest of the three today: $2.249/L to $2.489/L, averaging $2.378/L, a spread of just $0.240/L (about $12.00 per 50 litres). If your car is E10-compatible, it's the cheapest entry point on the board right now.

Because so much of the difference is local margin rather than oil, comparing sites is where the money is. Refil maps the cheapest servo near you, which is the simplest way to blunt a cycle-day hike.

What to do this week

If you're in an eastern capital and pump prices are still drifting down, fill the tank before the next single-morning jump rather than topping up in small dribbles — on unleaded 91 the difference between the cheapest and dearest site today is $20.75 a tank, and a cycle hike can add to that. In WA, check the 2:30pm FuelWatch listing the afternoon before and buy on the day it's frozen low. Diesel drivers should compare hardest: $22.60 per tank is the widest gap of the three fuels today.

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