Adelaide Unleaded Still Hasn't Reset, and a 4 Cent Wholesale Gap Explains Why

Adelaide Unleaded Still Hasn't Reset, and a 4 Cent Wholesale Gap Explains Why

A fortnight ago we said the signal to watch in Adelaide was a northern independent cutting 10 cents or more overnight, which is how a discount phase usually starts. At 1:45pm ACDT on 8th Oct 2026, that signal still hasn't arrived.

Across 256 servos from Munno Para to Seaford, the median unleaded price is 236.4. It was 209.9 on 12 September and reached 234.9 by the 21st. In the 17 days since, it has stayed inside a 3 cent band, and no servo in our sample has cut by more than 8.4 cents in a single move. You might be wondering why the cycle has stalled. The answer sits in a number most motorists never see.

A sale needs a markup

Think of it this way. A shop can only run a sale if there is a markup to cut into, and price cycles work the same way. After a big lift, the gap between what a servo pays for fuel and what it charges is wide, so retailers compete for customers by shaving a cent or two at a time. The price slides until that gap is nearly gone. Then someone lifts sharply and the cycle starts again.

So the size of that gap decides how much room there is to discount. The ACCC tracks it using the terminal gate price, which is the posted wholesale price at the fuel terminal. On 30 September, Adelaide's average terminal gate price for petrol was 229.1 cents and its average retail price was 233.1. That leaves 4.0 cents to cover rent, wages, freight, card fees and profit. On 31 March the same gap was 28.3 cents.

A 10 cent overnight cut from today's median would take the typical board below the 30 September wholesale figure. There is one caveat. The ACCC notes that fewer deals have been struck at posted prices since this year's supply disruptions, so costs vary between retailers. Several independents already sit below 229.1, which suggests they either buy below the posted price or accept a very thin return. Either way, there is little margin left to compete away.

The discount phase is running in half cents

Some servos are still cutting, just very slowly. Liberty in Clarence Gardens went from 224.9 to 224.3, 223.3, 222.9, 222.3 and then 221.9 over the past fortnight. Ampol Foodary Edwardstown took almost identical steps to 221.9, and U Go St Marys is at 222.9. Half cent steps are about as small as a price cut gets, and that is what you would expect when there is so little margin to give.

Two small lifts and a targeted cut

Meanwhile the larger chains have been testing the ceiling. On the evening of Monday 5 October, the Labour Day public holiday, 107 of the 109 OTR sites in our sample lifted, and Ampol, Caltex and EG Ampol followed within hours. In all, 181 servos rose by about 3 cents. OTR Unley now reads 239.4.

Early on Wednesday 7 October, six OTR sites in the inner north and west cut to 229.9, including OTR Pooraka, Mansfield Park, Para Hills, Mitchell Park and Holden Hill. That might look like the start of a reset. It is more likely local price matching, because independents and United Petroleum sites nearby were already at or below 229.5. Late that night, 29 of the 34 X Convenience sites lifted, typically by 5.4 cents, and eight of them went from 229.5 to 234.9.

OTR boards now span almost 10 cents, from 229.5 at Rosewater to 239.4 across Unley and Norwood, where several Ampol and EG Ampol sites sit at 239.9.

Where the value is today

The independents and smaller chains (United, Solo, U Go, Liberty and Mobil) have a median of 229.5, against 237.4 for OTR. That 7.9 cent gap is worth about $4 on a 50 litre tank. In Blair Athol, Solo, Mobil and United are all on 225.5, and U Go Clearview matches them. Compare boards near you on our unleaded petrol prices page.

What to watch next

With margins this thin, the next big move in Adelaide depends more on wholesale costs than on competition between retailers. The ACCC says wholesale changes usually take one to two weeks to reach the pump. If terminal gate prices fall, there is room again for a proper discount phase, and the 10 cent overnight cut becomes possible. If they hold, expect more small lifts like Monday's rather than a reset. Our price trends page and the guide to the best time to fill up in South Australia will show which way it breaks.

Once you know the gap between wholesale and retail, you can tell whether waiting for a reset is worth it. Right now it isn't, so filling at the cheaper end of the spread is the more reliable saving.