Market Update
Sunday 28 September 2025
Unleaded 91 and diesel · Brent crude, AUD/USD, capital pump prices, and city-by-city 4-week outlook
What moved this week
As of Sunday 28 September 2025, the national average for Unleaded 91 across Australia's capital cities sits at 177.4c/L, down 5.9c on last week. Diesel averages 177.4c/L nationally, with the cheapest reported bowser at 135.5c/L.
Wholesale market signals
Brent Crude
US$70.13
per barrel
Singapore MOGAS tracks Brent with ~1 week lag
AUD/USD
0.6554
exchange rate
A lower AUD raises the cost of imported fuel
Import Parity
138.7
cents per litre
Estimated wholesale cost before excise and GST
What this means for pump prices
Import parity hasn't moved much this week, so any pump price changes you see at the bowser will be driven mainly by the local discounting cycle rather than the global signal.
Capital city pump prices
Average and cheapest reported pump prices in each capital on Sunday 28 September 2025, with the change vs 7 and 30 days prior.
Averages computed from stations within a metro radius of each capital. 7d and 30d deltas apply to the U91 average.
How this update is generated
Each day at 6:00am AEST, PetrolPulse fetches the latest Brent crude spot price and AUD/USD exchange rate, then combines them using the standard Singapore MOPS import parity formula to estimate the wholesale cost of fuel delivered to Australian terminals.
Capital city averages are computed from live station-level data within a metro radius of each capital — not state-wide aggregates — so regional outliers don't skew the headline number. Comparisons against 7 and 30 days prior show whether the city was trending up or down on the day, separate from the wholesale signal.
The city-by-city cycle outlook combines local cycle-position analysis with the forward-looking macro signals above. When import parity moves significantly relative to current retail prices and the recent margin, the directional call updates automatically.