Don't get pumped.
As of 2 September 2026, the cheapest Premium Diesel in South Australia is 236.7c per litre at Costco, Blair Athol — versus the South Australia average of 253.6c (0.9c below the national average of 254.5c). Across 402 stations, Premium Diesel ranges from 236.7c to 299.9c, so filling a 50-litre tank at the cheapest station saves about $8.45 over the state average. Over the past week the SA average has risen 18.1c.
Compare Premium Diesel across 402 stations in South Australia. Updated 07:20 AM, 02 Sep 2026.
Over the past 90 days, Premium Diesel in South Australia has averaged 216.0c per litre, peaking at 253.8c on 27 August and bottoming out at 190.9c on 21 June — a range of 62.9c. Over the past week the SA average has risen 18.1c. Timing a fill-up around that range matters: on a 50-litre tank, filling at the period low instead of the peak saves $31.45.
| Month | Average Premium Diesel |
|---|---|
| April 2026 | 253.6c |
| May 2026 | 230.9c |
| June 2026 | 201.3c |
| July 2026 | 206.1c |
| August 2026 | 249.7c |
The cheapest Premium Diesel price in South Australia right now is 236.7c per litre, across 402 stations tracked. The cheapest suburb right now is Clearview at a 243.0c average across 2 stations. Filling a 50-litre tank at the cheapest station instead of a station charging the state average of 253.6c saves $8.45. See the live cheapest-stations list on this page for the exact station, address and suburb. Prices update twice daily from the official state government feed, so the cheapest station can change between the morning and afternoon updates — check again before you drive.
The current South Australia average for Premium Diesel is 253.6c per litre — 0.9c below the national average of 254.5c. Prices at individual stations range from 236.7c to 299.9c, a spread of 63.2c that shows how much shopping around can save. Over the past week the SA average has risen 18.1c. Petrolmate computes this average from every station reporting Premium Diesel in South Australia via the official government price feed, refreshed twice daily.
U-Go is currently the cheapest brand for Premium Diesel in South Australia at 241.5c per litre average across 5 stations. The gap between the cheapest brand (U-Go, 241.5c) and the priciest in our list (Mobil, 254.4c) is 12.9c per litre — about $6.45 per 50-litre tank. Brand averages are recalculated twice daily from official price data, so the cheapest brand can change with the price cycle.
Over the past 90 days, Premium Diesel in South Australia has averaged 216.0c per litre, peaking at 253.8c on 27 August and bottoming out at 190.9c on 21 June — a range of 62.9c. Over the past week the SA average has risen 18.1c. Monthly averages for the past half-year are published in the table on this page. All figures come from official South Australia government price reporting, aggregated daily by Petrolmate.