Don't get pumped.
As of 19 July 2026, the cheapest Premium Diesel in South Australia is 189.5c per litre at Mobil, Mount Gambier — versus the South Australia average of 208.6c (4.1c below the national average of 212.7c). Across 410 stations, Premium Diesel ranges from 189.5c to 250.0c, so filling a 50-litre tank at the cheapest station saves about $9.55 over the state average. Over the past week the SA average has risen 31.1c.
Compare Premium Diesel across 410 stations in South Australia. Updated 11:40 AM, 19 Jul 2026.
Over the past 81 days, Premium Diesel in South Australia has averaged 215.0c per litre, peaking at 251.1c on 29 April and bottoming out at 175.3c on 1 July — a range of 75.8c. Over the past week the SA average has risen 31.1c. Timing a fill-up around that range matters: on a 50-litre tank, filling at the period low instead of the peak saves $37.90.
| Month | Average Premium Diesel |
|---|---|
| May 2026 | 230.9c |
| June 2026 | 200.5c |
| July 2026 | 189.8c |
| Brand | Avg Price | Stations |
|---|---|---|
| Solo | 201.2c | 9 |
| Liberty | 202.0c | 7 |
| United | 203.7c | 10 |
| U-Go | 203.9c | 5 |
| Caltex | 204.7c | 26 |
| X Convenience | 204.8c | 47 |
| AM/PM | 205.8c | 16 |
| Independent | 206.2c | 3 |
The cheapest Premium Diesel price in South Australia right now is 189.5c per litre, across 410 stations tracked. The cheapest suburb right now is Mount Gambier at a 194.0c average across 5 stations. Filling a 50-litre tank at the cheapest station instead of a station charging the state average of 208.6c saves $9.55. 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 208.6c per litre — 4.1c below the national average of 212.7c. Prices at individual stations range from 189.5c to 250.0c, a spread of 60.5c that shows how much shopping around can save. Over the past week the SA average has risen 31.1c. Petrolmate computes this average from every station reporting Premium Diesel in South Australia via the official government price feed, refreshed twice daily.
Solo is currently the cheapest brand for Premium Diesel in South Australia at 201.2c per litre average across 9 stations. The gap between the cheapest brand (Solo, 201.2c) and the priciest in our list (OTR, 207.9c) is 6.7c per litre — about $3.35 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 81 days, Premium Diesel in South Australia has averaged 215.0c per litre, peaking at 251.1c on 29 April and bottoming out at 175.3c on 1 July — a range of 75.8c. Over the past week the SA average has risen 31.1c. 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.