Whyalla Unleaded Sits 10.7 Cents Above Adelaide While Port Augusta Holds a Steady 6 Cent Discount
Motorists in Whyalla are paying an average of 243.6 cents a litre for unleaded at 8:12am AEST on 2nd Oct 2026. That is 10.7 cents more than the 232.9 cent average across 160 servos within 15 kilometres of Adelaide. About 75 kilometres up the Lincoln Highway, Port Augusta averages 237.3. The gap between Whyalla and Port Augusta is not a quirk of this week. It has held almost to the cent through the whole of September's rise.
Tight price bands in all three cities
Prices in each Spencer Gulf city sit within a narrow band. All six Whyalla servos reporting to South Australia's official fuel pricing scheme are between 242.9 and 243.9, just one cent apart. Perrys on Beerworth Avenue is the cheapest at 242.9, and EG Ampol on Ekblom Street is the dearest at 243.9.
Port Pirie looks much the same. Its ten servos, including the highway sites at Warnertown and Bungama, run from 241.5 at Ampol on Main Road up to 242.9, for an average of 242.4.
Port Augusta has the widest spread of the three, and also the lowest prices. Liberty on Daw Street is at 234.5, AM/PM and the BP truckstop on the Princes Highway are at 236.9, and most of the other boards show 237.7 or 237.9.
A gap that held through a 24 cent climb
OTR has a servo in each of the three cities, and its boards show the pattern best. On 11th Sep it was charging 219.9 in Whyalla and Port Pirie South, and 213.9 in Port Augusta. Over the next eleven days all three climbed almost every night, peaking at 244.9 in Whyalla and Port Pirie South and 239.9 in Port Augusta.
Today those OTR boards read 243.7, 242.7 and 237.7. Between Whyalla and Port Augusta the gap was 6.0 cents before the rise, and it is exactly 6.0 cents now. Shell Reddy Express has the same 6.0 cent margin between its Whyalla site and its Port Augusta West roadhouse.
Port Augusta started lower, so some of its servos had further to climb. The BP truckstop sat at 202.9 between 11th and 13th Sep and reached 238.9 by 24th Sep, a lift of 36 cents, before easing to 236.9. EG Ampol Port Augusta went from 207.9 to 238.9 and now reads 237.9.
Easing has been slower in the north
Prices are coming back down at different speeds across the state. Since the peak around 22nd Sep:
* Whyalla OTR has eased 1.2 cents, and EG Ampol Whyalla 1.0 cent
* Shell and Ampol in Port Pirie have each eased 3.0 cents
* OTR Pulteney Street in the Adelaide CBD has eased 2.0 cents
* OTR and EG Ampol in Victor Harbor have eased about 4 cents
That has taken Victor Harbor under Adelaide. Its six servos average 231.3, which is 1.6 cents below the city, with Liberty McCracken on 228.9 and X Convenience Hayborough on 229.9. Mount Gambier averages 233.2, close to the metro figure, and five of its twelve servos (Pearl Energy, Mobil, APCO, United and Matthews Petroleum) are matched at 229.5.
This is the comparison that caught my attention. Victor Harbor and Mount Gambier are regional centres too, and both sit within two cents of Adelaide. Being regional does not explain the Spencer Gulf premium on its own.
What it means for motorists
On a 60 litre tank, the current averages work out to:
* Whyalla against Adelaide: about $6.40 more per fill
* Whyalla against Port Augusta: about $3.80 more per fill
* Port Pirie against Port Augusta: about $3.10 more per fill
It is not worth a special trip, though. The 150 kilometre round trip from Whyalla to Port Augusta uses around 13 litres in a typical car, which costs far more than the $3.80 saved. If the drive is already planned, such as a run down to Adelaide or a weekend in the Flinders Ranges, the saving is worth taking, since both routes pass through Port Augusta.
Inside Port Augusta, Liberty at 234.5 is 3.4 cents under the 237.9 boards, the largest local spread in the region. In Whyalla and Port Pirie every servo sits within about 1.5 cents of the others, so filling up wherever is convenient costs very little. The savings calculator will put a figure on your own driving.
You can follow these movements on the price trends page and compare current unleaded petrol prices across the state before you head out.
The numbers are clear: Spencer Gulf prices are moving in step with Adelaide, but from a starting point 4 to 11 cents higher, and that gap has not narrowed as prices ease.