Western Australian service station chain Burk is facing civil action in the Supreme Court of WA over allegations it sold regular 91-octane unleaded petrol as its more expensive 98-octane premium grade. The state's Consumer Protection Agency ordered independent testing of fuel samples from the chain, which runs 14 sites across Perth and regional WA, and said all samples sold as B-Pro Premium 98 came back as 91RON unleaded.
What the testing found
Consumer Protection Commissioner Trish Blake described the alleged switch as a significant difference in value and a massive breach of trust, telling 102.5 ABC Perth that drivers have no independent way to inspect fuel before they buy it. "You have to be able to rely and trust on the trader," she said.
The gap between grades is not trivial at the pump. The ACCC puts the average price difference between 98-octane and 91-octane at 20 to 25 cents per litre. In a Toyota RAV4 hybrid, Australia's top-selling SUV, which carries a 55-litre tank across current hybrid versions, that works out to as much as $13.75 more per fill.

Why the wrong grade matters
Regular unleaded is not suitable for every car on Australian roads. The RAV4 hybrid needs at least 95-octane premium unleaded, so a driver filling one with 91-octane while paying for 98 is both overpaying and running the car on a grade it was not designed for. Blake said many high-performance cars only run well on high-performance fuel, which makes the alleged substitution more than a pricing complaint.
The timing is awkward for motorists. Australian fuel prices hit record petrol and diesel pump levels earlier this year, prompting the federal government to pause its fuel excise and the heavy vehicle road user charge. Paying a premium for a grade you are not getting lands harder in that climate.
The court action and possible penalties
Burk Fuel Pty Ltd and Burk Pty Ltd deny the allegations and declined to comment while the matter is pending. The case is a civil proceeding in the Supreme Court of WA.
There is no standard penalty for this kind of breach. The maximum is $100 million, three times the value of the breach, or 30 per cent of the offending company's turnover during the breach period.
Precedent exists. Dojoo Pty Ltd, trading as Ballina Petroleum Distributors in northern New South Wales, was fined $400,000 for delivering nearly two million litres of regular unleaded petrol into storage.
A hearing date has not been announced, so when the Supreme Court of WA will decide the matter is not yet known.

What it means for drivers
For buyers of premium-only models, the case is a reminder that the grade on the bowser is only as good as the operator behind it. The practical defence is a receipt that names the grade and the price paid, which gives a driver something to point to if a claim is ever disputed.
For Burk, the exposure is not just the alleged price gap on each litre. The penalty framework scales with turnover and the value of the breach, which means the final bill, if the allegations are upheld, could sit well above the per-fill difference that individual drivers saw.



