Sydney's price cycle in plain English
Sydney runs one of the longer discount cycles in Australia. Since 2022 it has stretched from the textbook two weeks out to anywhere from 18 to 28 days between peaks, depending on global supply and which major brand moves first. Prices typically climb 25-35¢/L in a single day (the "jump"), then grind down 1-3¢/L per day for the next three to four weeks until the next jump. The cheapest day to fill up is almost always the day before the next jump — which is exactly what PetrolPulse's forecast is trying to call.
Why Sydney data is unusually good
NSW has the most aggressive fuel price transparency law in Australia. Under the FuelCheck scheme every retailer must report a price change to the government within 30 minutes of making it. That feed is what PetrolPulse ingests — so the prices on this page are within minutes of what you'd see at the bowser, across all ~600 stations in the Sydney metro area. Compare that to Melbourne, where the equivalent VIC scheme only publishes a daily price cap, not real-time changes.
Where the cheap stations cluster
Independents and supermarket-aligned brands (7-Eleven, Costco, Coles Express, United, Metro) are usually the first to drop their price after a jump and the slowest to raise it. They cluster in western and south-western Sydney corridors — Liverpool, Parramatta, Penrith, Campbelltown — where competition is densest. Eastern suburbs and the lower North Shore consistently run 8-15¢/L above the metro median because there are fewer competing stations within driving distance.