Clare Unleaded Petrol Climbs 20 Cents as South Australia Fuel Prices Push Higher Across the Board
A comprehensive analysis of this weekend's fuel pricing data reveals that South Australia motorists are wearing some of the steepest increases recorded anywhere in the country, with the Clare Valley town of Clare absorbing a 20.2 cent jump in unleaded petrol over a single trading day.
According to data captured at 8:02am ACST on 17th May 2026, the average price of unleaded petrol prices across Clare's five servos has lifted to 199.4 cents per litre, up from 179.2 cents the day before. That is an 11.3 per cent increase, and it pushes a regional town that was sitting comfortably under the 180 cent mark into territory normally reserved for the most expensive corners of the state. For a motorist filling a typical 60 litre tank, the difference works out to roughly 12 dollars in a single 24 hour period.
A statewide pattern, not an isolated spike
The Clare result is not an outlier. It forms part of a broader lift across South Australia, where diesel has also moved sharply. The state diesel average across 373 stations has climbed 10 cents to 237.1 cents per litre, with prices ranging from a low of 210.9 cents to a high of 339.9 cents. That spread of roughly 129 cents underlines just how much pricing varies depending on where a driver chooses to stop.
The pattern is consistent with what we have been tracking on the eastern seaboard over the past fortnight. New South Wales diesel has risen 9.3 cents to a state average of 236.8 cents, while Queensland diesel added 8.4 cents to reach 237.6 cents. South Australia has now joined that climb rather than holding apart from it, a meaningful shift for a state that often follows the east coast cycle on a short delay.
Why the prices are moving
The increase reflects a familiar set of industry factors. Wholesale terminal gate prices set the floor that retailers work from, and when that floor lifts, regional towns with fewer competing servos tend to feel it first and feel it hardest. Clare has only a handful of outlets servicing the surrounding agricultural district, so there is limited competitive pressure to absorb a wholesale rise. Thin local competition translates directly into sharper movements at the bowser.
Historical comparison helps frame the scale here. When this masthead reported on Adelaide diesel joining the east coast climb on 8th May, the state diesel figure was 250.5 cents. The current 237.1 cent average shows diesel has actually eased from that peak even as unleaded has climbed, a reminder that the two fuels do not always move in step. Motorists who drive diesel utes and those who run standard petrol cars are effectively reading two different markets right now.
Regional variations remain stark
South Australia still sits in the middle of the national pack. The Northern Territory continues to carry the heaviest burden, with a diesel average of 290.2 cents and outback readings stretching toward 399 cents. The Australian Capital Territory averages 261.1 cents for diesel. Against that backdrop, South Australia's 237.1 cent figure looks moderate, though that offers cold comfort to a Clare driver staring at a near 200 cent unleaded board.
Not every state is climbing. Victoria and Western Australia both recorded modest easing this weekend. Prices in Bacchus Marsh showed unleaded falling 14.3 cents to 179.0 cents, while St Albans in Melbourne's north west shed 13.1 cents to 182.4 cents. In New South Wales, premium grades softened in Cessnock in the Hunter region. The market is clearly running on different clocks depending on where a town sits in its local cycle.
What South Australia drivers can do
For motorists in and around the Clare Valley, the practical advice is straightforward. A 20 cent overnight rise often signals the top of a local cycle, and prices that climb this quickly frequently retreat over the following one to two weeks. Drivers who can delay a non urgent fill, or who pass through Adelaide where competition is denser, stand to recover much of that 12 dollar gap.
Checking the price trends tool before committing to a tank remains the single most reliable way to read whether a town is near its peak or its trough. For motorists willing to shop around, the data clearly demonstrates that location and timing remain the two most important factors in fuel savings.
