Don't get pumped.
As of 18 October 2026, the cheapest Premium Diesel in South Australia is 269.9c per litre at BP, Mount Gambier — versus the South Australia average of 280.8c (1.5c below the national average of 282.3c). Across 36 stations, Premium Diesel ranges from 269.9c to 287.4c, so filling a 50-litre tank at the cheapest station saves about $5.45 over the state average. Over the past week the SA average has fallen 3.1c.
Compare Premium Diesel across 36 stations in South Australia. Updated 03:52 AM, 18 Oct 2026.
Over the past 79 days, Premium Diesel in South Australia has averaged 269.6c per litre, peaking at 290.2c on 12 October and bottoming out at 235.4c on 31 July — a range of 54.8c. Over the past week the SA average has fallen 3.1c. Timing a fill-up around that range matters: on a 50-litre tank, filling at the period low instead of the peak saves $27.40.
| Month | Average Premium Diesel |
|---|---|
| April 2026 | 253.6c |
| May 2026 | 230.9c |
| August 2026 | 249.7c |
| September 2026 | 269.6c |
| October 2026 | 281.3c |
The cheapest Premium Diesel price in South Australia right now is 269.9c per litre, across 36 stations tracked. The cheapest suburb right now is Mount Gambier at a 270.9c average across 2 stations. Filling a 50-litre tank at the cheapest station instead of a station charging the state average of 280.8c saves $5.45. 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 280.8c per litre — 1.5c below the national average of 282.3c. Prices at individual stations range from 269.9c to 287.4c, a spread of 17.5c that shows how much shopping around can save. Over the past week the SA average has fallen 3.1c. Petrolmate computes this average from every station reporting Premium Diesel in South Australia via the official government price feed, refreshed twice daily.
EG Ampol is currently the cheapest brand for Premium Diesel in South Australia at 279.4c per litre average across 4 stations. The gap between the cheapest brand (EG Ampol, 279.4c) and the priciest in our list (OTR, 283.7c) is 4.3c per litre — about $2.15 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 79 days, Premium Diesel in South Australia has averaged 269.6c per litre, peaking at 290.2c on 12 October and bottoming out at 235.4c on 31 July — a range of 54.8c. Over the past week the SA average has fallen 3.1c. 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.