Don't get pumped.
As of 21 July 2026, the cheapest Premium Diesel in Western Australia is 192.5c per litre at Shell, Katanning — versus the Western Australia average of 216.7c (0.2c below the national average of 216.9c). Across 451 stations, Premium Diesel ranges from 192.5c to 261.9c, so filling a 50-litre tank at the cheapest station saves about $12.10 over the state average. Over the past week the WA average has risen 33.9c.
Compare Premium Diesel across 451 stations in Western Australia. Updated 11:17 AM, 21 Jul 2026.
Over the past 83 days, Premium Diesel in Western Australia has averaged 215.3c per litre, peaking at 254.5c on 29 April and bottoming out at 177.2c on 1 July — a range of 77.3c. Over the past week the WA average has risen 33.9c. Timing a fill-up around that range matters: on a 50-litre tank, filling at the period low instead of the peak saves $38.65.
| Month | Average Premium Diesel |
|---|---|
| May 2026 | 231.3c |
| June 2026 | 202.0c |
| July 2026 | 192.9c |
The cheapest Premium Diesel price in Western Australia right now is 192.5c per litre, across 451 stations tracked. The cheapest suburb right now is Edgewater at a 197.2c average across 2 stations. Filling a 50-litre tank at the cheapest station instead of a station charging the state average of 216.7c saves $12.10. 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 Western Australia average for Premium Diesel is 216.7c per litre — 0.2c below the national average of 216.9c. Prices at individual stations range from 192.5c to 261.9c, a spread of 69.4c that shows how much shopping around can save. Over the past week the WA average has risen 33.9c. Petrolmate computes this average from every station reporting Premium Diesel in Western Australia via the official government price feed, refreshed twice daily.
Solo is currently the cheapest brand for Premium Diesel in Western Australia at 197.7c per litre average across 3 stations. The gap between the cheapest brand (Solo, 197.7c) and the priciest in our list (BP, 216.2c) is 18.5c per litre — about $9.25 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 83 days, Premium Diesel in Western Australia has averaged 215.3c per litre, peaking at 254.5c on 29 April and bottoming out at 177.2c on 1 July — a range of 77.3c. Over the past week the WA average has risen 33.9c. Monthly averages for the past half-year are published in the table on this page. All figures come from official Western Australia government price reporting, aggregated daily by Petrolmate.