Market Update
Tuesday 19 May 2026
Unleaded 91 and diesel · Brent crude, AUD/USD, capital pump prices, and city-by-city 4-week outlook
What moved this week
As of Tuesday 19 May 2026, the national average for Unleaded 91 across Australia's capital cities sits at 185.3c/L, up 1.3c on last week. Diesel averages 234.8c/L nationally, with the cheapest reported bowser at 192.3c/L. Wholesale import costs lifted 3.2% over the past week to an estimated 173.0c/L — the input that flows through to pump prices over the following one to two weeks.
Wholesale market signals
Brent Crude
US$111.36
per barrel
Singapore MOGAS tracks Brent with ~1 week lag
AUD/USD
0.7111
exchange rate
A lower AUD raises the cost of imported fuel
Import Parity
173.0
cents per litre
Estimated wholesale cost before excise and GST
What this means for pump prices
Brent crude climbed 3.4% over the past week to US$111.36 per barrel, while the Australian dollar weakened 1.8% against the US dollar, lifting the local cost of imported fuel. These are the two inputs that, together with refining and shipping margins, determine the wholesale cost of fuel landed at Australian terminals.
The four-week outlook is broadly stable. Prices remain elevated — global supply costs are higher than usual Petrol import costs are currently around 25% above where they were six weeks ago, driven by global supply disruptions. While costs have stabilised in the short term, the price floor has risen — expect to pay more than historical averages for the foreseeable future. Short-term cycle swings still apply, but each peak and trough will be higher than what was normal before the disruption.
Historically, moves in import parity take about 10-14 days to show up at the bowser. With wholesale increases this week, you can expect the pressure to filter through to pump prices over the next two weeks — earlier in metros that follow a tight price cycle, later in regional markets where retailers smooth changes out.
Capital city pump prices
Average and cheapest reported pump prices in each capital on Tuesday 19 May 2026, with the change vs 7 and 30 days prior.
| City | U91 avg | U91 cheap |
|---|---|---|
| Sydney | 187.6c | 168.9c |
| Melbourne | 186.1c | 149.9c |
| Brisbane | 187.2c | 165.5c |
| Adelaide | 178.1c | 166.7c |
| Perth | 174.4c | 159.3c |
| Canberra | 183.7c | 173.9c |
| Hobart | 188.9c | 176.0c |
| Darwin | 196.7c | 175.9c |
Averages computed from stations within a metro radius of each capital. 7d and 30d deltas apply to the U91 average.
City-by-city cycle outlook
Where each capital sat in its local discounting cycle on Tuesday 19 May 2026, and what the model was telling drivers to do.
Sydney
Cycle position unclearYou have timeMon, Thu is historically the cheapest day to fill up in Sydney. That's 1 day away. If your tank allows, waiting could save up to 3.2¢/L. Global supply costs are currently 25% above their level six weeks ago. Prices may stay elevated longer than the usual cycle would suggest.
Melbourne
Near peak — likely to fall soonFill when you need toNot enough of a clear pattern to make a strong call right now. Fill up when you need to.
Brisbane
Cycle position unclearYou have timeFri–Sun is historically the cheapest day to fill up in Brisbane. That's 2 days away. If your tank allows, waiting could save up to 2.8¢/L. Global supply costs are currently 25% above their level six weeks ago. Prices may stay elevated longer than the usual cycle would suggest.
Perth
Falling — heading toward troughFill when you need toPrices are stable right now. Tuesday tends to be the cheapest day in Perth. Fill up when convenient. Global supply costs are currently 25% above their level six weeks ago. Prices may stay elevated longer than the usual cycle would suggest.
Adelaide
Cycle position unclearFill when you need toNo clear timing signal right now. Fill up when you need to.
Canberra
Cycle position unclearYou have timeA price low is expected in about 6 days — worth holding off if your tank allows. Global supply costs are currently 25% above their level six weeks ago. Prices may stay elevated longer than the usual cycle would suggest.
Hobart
Falling — heading toward troughFill when you need toNot enough of a clear pattern to make a strong call right now. Fill up when you need to.
Darwin
Near trough — cycle lowYou have timeFri–Sun is historically the cheapest day to fill up in Darwin. That's 2 days away. If your tank allows, waiting could save up to 4.3¢/L. Global supply costs are currently 25% above their level six weeks ago. Prices may stay elevated longer than the usual cycle would suggest.
Looking ahead
Melbourne is in the rising leg of the local price cycle, so expect bowser prices to climb before they fall again; Perth, Hobart, Darwin are on the falling leg, which is when local prices typically reach their lowest before the cycle resets.
If your tank can wait, the next predicted price low is approaching in Sydney (around 45 days away from the next trough), Brisbane (around 16 days away from the next trough), Canberra (around 6 days away from the next trough).
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.