The South Australia regional watchdog fined six petrol stations nearly $20,000 for pricing violations.
The watchdog ran checks and found problems mainly around charging standards.
Customers were encouraged to call in if they spotted price inflation at pumps during the sweep.
No brand names or location details were released yet.
Total fines total after ongoing patrol visits.
In Greater Western Sydney, Blacktown motorists now face higher for fuel than surrounding districts.
Regular pump checks indicate the area’s prices exceed other local stations.
The gap means drivers there spend more per litre each time they fill up.
The gap has expanded than what regulators expect in normal regional swings.