War pump shock + state relief: is your price still fair?

Why Did Australian Petrol Prices Spike in 2026?

The Iran-US war triggered two mechanisms: Brent crude rose sharply (from roughly $72 toward $90+/barrel), which mechanically raised TGP. But separately, several major retailers raised pump prices faster than TGP alone justified — leading to hundreds of ACCC gouging reports. In late March 2026, some states temporarily halved fuel excise or expanded free/discounted public transport to ease household pain—policy that changes your net out-of-pocket even when pump boards stay high. Singapore Mogas 95 (the regional benchmark) moved with crude, and AUD weakness amplified landed cost.

Understanding the Terminal Gate Price (TGP)

The TGP is the wholesale price at which fuel leaves the terminal and enters the retail supply chain. It's published daily by major oil companies (Viva Energy, Ampol, BP, Puma). The TGP includes: crude oil import cost, refining/processing cost, shipping from the port terminal. The ACCC publishes weekly TGP monitoring data. A fair retail price should be TGP + 4-8c/L margin + GST (10%).

The 7-10 Day Price Cycle: When to Fill Up

Sydney, Melbourne, Brisbane, and Adelaide have a documented 7-10 day petrol price cycle. After hitting the cycle trough (lowest price), prices jump 20-30c/L over 3-4 days, then gradually fall back. In Sydney, prices typically hit the trough on Tuesday or Wednesday. Filling up during the trough vs. peak saves ~25c/L — roughly $10 per 40-litre fill. Use GasBuddy or MotorMouth to track the current cycle position.

How to Report Petrol Price Gouging

• ACCC PetrolWatch: accc.gov.au/petrolwatch — online form or call 1300 302 502
• WA FuelWatch: fuelwatch.wa.gov.au — regulated prices in WA, complaints directly to Energy Policy WA
• What to include: Station name, address, fuel type, price observed, TGP on that day (accc.gov.au/tgp), date and time
• ACCC powers: Can investigate under s. 21 Competition and Consumer Act (unconscionable conduct) — fines up to $50M for corporations

Tax Breakdown: Where Your Petrol Dollar Goes

At 200c/L: crude oil ~60c, refining/shipping ~22c, excise 50.8c, retailer margin ~5c, GST ~18.2c. The federal government collects ~69c of every litre (excise + GST component on excise) — making it the largest single beneficiary of petrol price rises on a per-litre basis. The government earned an estimated $1.2 billion in extra excise/GST revenue in the first month of the Iran-war price spike.

Remote and Regional Petrol Premiums

Remote areas legitimately command higher prices due to transport costs — typically 8-15c/L above major city prices. The ACCC's remote fuel monitoring report identified $47M in unjustified overcharging in remote communities in 2024. During the Iran-war spike, some NT and WA outback towns hit 270c/L — 70c above fair value. The Australian Government's Remote Area Fuel Initiative provides 5.6c/L subsidy to registered remote retailers but doesn't prevent excessive margins.

FAQ

How to Save on Fuel

• Use fuel tracking apps: GasBuddy, MotorMouth, PetrolSpy — saves avg $200-400/year by hitting cycle troughs
• Fuel cards/loyalty: Woolworths Everyday Rewards (4c/L discount), Coles Shell (4c/L) — stack with cycle timing
• E10 vs ULP: E10 is typically 5-8c/L cheaper — compatible with most post-2000 vehicles
• Tyre pressure: Every 10 PSI below optimal reduces fuel economy 0.2% — check monthly, save ~$80/year