Fuel pricing · Australia
Why Is Petrol So Expensive?
If you have filled up recently and winced at the total, you are not imagining it — petrol prices in Australia have been volatile for years, and the line at the bowser rarely matches what you remember paying twelve months ago. Petrol prices are shaped by a chain of global and local forces: crude oil markets, refining margins, shipping costs, the Australian dollar, government taxes, and the competitive behaviour of local fuel retailers all stack on top of each other before a single litre reaches your tank.
This guide breaks down exactly why petrol is so expensive in Australia right now, how that compares with diesel prices, and what actually moves the cost of fuel from week to week. We explain the mechanics in plain language — no jargon, no scare headlines — and back every claim with how the Australian fuel market actually works, drawing on public reporting from the Australian Competition and Consumer Commission (ACCC), the Australian Institute of Petroleum (AIP), and the Australian Government fuel excise schedule.
You will also get a realistic answer to the question everyone asks next: when will petrol prices go down? We cover the price cycle, the global supply factors worth watching, and a set of practical tips that can meaningfully cut your annual fuel spend regardless of what crude oil does next.
Reviewed by Petrol Prices Near Me Editorial Team — June 2026
Quick answer
Petrol is expensive in Australia mainly because of four stacked costs: the wholesale price of refined petrol (tied to global crude oil and Asian refining margins), the falling Australian dollar (which makes imported fuel cost more in local terms), government fuel excise and GST (over 50 cents per litre combined), and local retail margins that rise and fall through the weekly price cycle.
Why Are Fuel Prices Rising In Australia?
Fuel prices in Australia rise and fall on the back of a small number of global and local forces stacked on top of each other. None of them act alone — a fall in crude oil prices can be cancelled out by a weaker Australian dollar, and stable global markets can still produce a higher local price if refining costs or local margins move. Understanding each layer separately makes the bowser board far less mysterious.
Global Oil Prices And Crude Oil Markets
Crude oil is the raw material behind every litre of petrol. Benchmark prices such as Brent crude move on global supply and demand: production decisions from OPEC and its allied producers (OPEC+), output from non-OPEC suppliers, economic growth in major economies, and disruptions to shipping routes or producing regions. Australia does not set the crude oil price — it is a price-taker on a global market, alongside every other importing nation.
Refining Costs And Asian Benchmark Pricing
Crude oil has to be refined into petrol before it is usable, and Australia now imports the large majority of its refined fuel rather than refining it domestically, after several local refinery closures over the past two decades. Australian retail petrol prices are commonly benchmarked against the Singapore Mogas 95 import parity price — the cost of refined petrol landed from the major Asia-Pacific refining hub. When Asian refining margins widen, for example due to refinery maintenance shutdowns or strong regional demand, the import cost of Australian petrol rises even if crude oil itself is flat.
Import And Shipping Costs
Refined petrol then has to be shipped to Australian terminals and trucked to individual stations. Freight rates for product tankers, insurance costs on shipping routes, and terminal handling fees all add to the landed cost. Disruptions to major shipping lanes — even ones that do not carry Australian cargo directly — can lift freight rates globally and flow through to local fuel costs with a lag of several weeks.
The Australian Dollar Exchange Rate
Refined fuel is traded internationally in US dollars. When the Australian dollar weakens against the US dollar, Australian importers need more local-currency dollars to buy the same amount of fuel — effectively a hidden price rise even when the US-dollar price of oil has not moved at all. A weak Australian dollar is one of the most underappreciated reasons petrol feels expensive during periods when international oil headlines look calm.
Government Taxes And Fuel Excise
On top of the wholesale cost, every litre carries federal fuel excise — a fixed cents-per-litre tax, indexed twice a year in line with the Consumer Price Index — plus 10% GST applied to the fuel price and excise combined. These taxes do not change with global oil prices, so they make up a larger share of the pump price when wholesale costs are low and a smaller share when wholesale costs spike. See what is fuel excise in Australia below for the exact mechanics.
How Petrol Prices Are Determined
Strip away the daily noise and every litre of petrol you buy is priced through five layers. Retailers do not set prices arbitrarily — most are working with thin margins on fuel itself and competing hard for the foot traffic that visits the attached convenience store.
| Cost layer | What drives it |
|---|---|
| Crude oil costs | Global supply and demand, OPEC+ decisions, shipping disruptions |
| Refining costs | Asian refining margins, refinery maintenance, regional demand |
| Distribution costs | Shipping, terminal storage, road transport to stations |
| Retail competition | Number of nearby stations, brand discount cycles, site overheads |
| Government taxes | Federal fuel excise (indexed) plus 10% GST |
The first three layers — crude oil, refining and distribution — are largely outside any individual retailer's control and move slowly over weeks and months. Retail competition is the layer that changes daily and explains why two stations a few hundred metres apart can show noticeably different prices on the same afternoon.
Why Diesel Is Often More Expensive Than Petrol
Diesel and petrol used to follow a simple rule of thumb — diesel was usually the cheaper fuel. That has flipped in recent years, and the reasons sit entirely on the demand side of the market.
Supply Constraints
Global refining capacity dedicated to diesel and other distillates has not grown as quickly as demand, partly because several refineries in mature markets have closed rather than upgraded. That leaves a tighter global pool of diesel supply relative to the fuels used in passenger cars.
Freight Industry Demand
Trucking, rail and shipping logistics run almost entirely on diesel, and freight volumes recovered strongly after recent global disruptions. That demand does not ease off the way passenger petrol demand can when household budgets tighten.
Mining Industry Demand
Mining and heavy construction equipment is overwhelmingly diesel-powered. Australia's large resources sector adds significant domestic diesel demand on top of global industrial demand, competing for the same import cargoes that supply suburban bowsers.
Agricultural Demand
Farm machinery, irrigation pumps and agricultural transport rely heavily on diesel, and seasonal harvest and planting periods can create regional demand spikes that put further pressure on supply.
Global Diesel Shortages
Periodic global distillate shortages — driven by a combination of refinery outages, strong industrial demand and shipping disruptions — have pushed international diesel prices above petrol prices for extended stretches, a trend that flows directly into Australian import costs. For a full breakdown, read our dedicated explainer on why diesel is so expensive.
What Is Fuel Excise In Australia?
Federal Fuel Excise
Fuel excise is a federal tax charged on every litre of petrol and diesel sold in Australia, collected from fuel producers and importers and built into the wholesale price before fuel ever reaches a retail bowser. The rate is indexed twice a year, in line with the Consumer Price Index, under rules set out by the Australian Government.
GST On Fuel
On top of excise, the standard 10% Goods and Services Tax (GST) applies to the combined fuel price and excise amount — meaning GST is effectively charged on a tax, not just on the underlying fuel cost.
A Worked Example
At a reference Melbourne metro average of 192.7 c/L for ULP 91, federal excise and GST together typically account for 74% of the pump price, with the remainder covering wholesale fuel costs, distribution and retail margin. Premium grades show the same tax structure on a higher base price — 210.3 c/L for PUL95 and 221.8 c/L for PUL98 in the current snapshot — so the dollar amount of tax per litre is identical across grades even though the percentage share differs slightly.
Why Are Petrol Prices Different Between Cities?
Melbourne, Sydney, Brisbane, Perth and Adelaide each run their own retail market with different competitive dynamics, freight distances from import terminals, and cycle behaviour. Perth has historically run one of the most predictable weekly cycles in the country, while Melbourne and Sydney cycles can vary in length and depth depending on how aggressively major retailers compete in a given period. Brisbane and Adelaide sit somewhere between the two, influenced by their own mix of independent and major-brand competition.
Within Melbourne itself, suburb-level prices can vary by 10–20 cents per litre on the same day. Inner-city suburbs with high site costs and less direct competition sometimes sit above outer suburbs with several competing stations clustered together. Compare your own suburb against nearby options on the suburb directory or the live fuel price map rather than assuming a city-wide average applies to your street.
Understanding Petrol Price Cycles
Most Australian capital cities experience a repeating retail price cycle on unleaded petrol: prices spike sharply on a reset day, then gradually discount over the following one to two weeks as retailers compete for market share, before resetting again. This cycle sits on top of — and is separate from — the slower wholesale-price movements driven by crude oil and the exchange rate.
Wholesale markets set the floor the cycle moves around; retail pricing and discounting determine where in that range you actually pay on a given day. Filling up during the middle-to-late discount phase, rather than just after a reset, is consistently the single biggest lever an everyday driver has over their fuel spend. Our dedicated Melbourne petrol price cycle guide walks through how to read the cycle in practice.
When Will Petrol Prices Go Down?
In the short term, prices are most likely to fall when your city is in the early-to-middle stage of its retail discount phase — typically within one to two weeks of the last reset. Checking live local data is far more reliable than any general rule, since cycle timing varies by city and shifts over time as competitive behaviour among retailers changes.
Over the medium term, a sustained drop in petrol prices generally requires global oil supply to grow faster than demand. That can happen through increased output from OPEC+ members or non-OPEC producers, softer global demand growth, or new refining capacity easing Asian benchmark margins. Combined with a stronger Australian dollar, those factors reduce the local-currency cost of imported fuel. None of these move on a fixed schedule, which is why responsible forecasting talks in terms of conditions rather than dates — treat any specific prediction, including the general trends described here, as indicative rather than guaranteed.
For a deeper, dedicated breakdown of the forecasting factors and how to track them yourself, see when will petrol prices drop.
Expert Tips To Save Money On Fuel
- Compare live suburb prices before you fill up using a fuel price map rather than relying on memory or the first station you pass.
- Track your city's price cycle and aim to fill during the discount phase rather than immediately after a reset.
- Join fuel retailer loyalty and discount-voucher programs — supermarket fuel dockets and app-based loyalty discounts can save several cents per litre with no extra effort.
- Use a fuel price comparison app that sends alerts when prices in your saved suburbs drop below a threshold you set.
- Avoid topping up small amounts frequently at whatever station is closest — plan fill-ups around price cycle timing where practical.
- Check whether 91 octane suits your vehicle before paying for premium 95 or 98 — only use premium if your manufacturer requires it.
- Maintain correct tyre pressure; under-inflated tyres measurably increase fuel consumption.
- Remove unnecessary roof racks, boxes and excess weight that increase drag and consumption.
- Drive smoothly — gentle acceleration and early braking reduce consumption more than any single fuel-saving gadget.
- Combine errands into fewer trips to reduce cold-engine starts, which use more fuel per kilometre than a warmed engine.
- Use cruise control on the highway where safe to do so, to maintain a steady, efficient speed.
- Service your vehicle on schedule — a poorly tuned engine or clogged air filter increases fuel use.
- Model your annual running cost with a fuel efficiency calculator to see where savings actually add up.
- Consider whether a smaller-engine or hybrid vehicle would cut your annual fuel spend if you are due for a change of car.
- Avoid idling for long periods — switch off the engine rather than waiting with it running.
Frequently Asked Questions
Why is petrol so expensive right now?
Current petrol prices reflect global crude oil and refined-product costs, a weaker Australian dollar (which raises the local cost of imported fuel), federal fuel excise and GST, and the phase of the local retail price cycle. Retail margins move with competition, so the same global cost can produce different bowser prices in different suburbs.
Why is petrol so expensive today?
Day-to-day moves usually come from the local retail cycle resetting after a discount phase, rather than from sudden changes in crude oil. Check whether your area has just entered a 'reset' — prices typically peak just after a reset, then gradually discount over the following one to two weeks.
Why are petrol prices rising in Australia?
Petrol prices rise when international benchmark prices for refined petrol (often priced off Singapore terminal gate prices for Asia-Pacific markets) increase, when the Australian dollar weakens against the US dollar, or when local wholesale and retail margins widen. Refinery outages, shipping disruptions and seasonal demand spikes can all contribute.
What makes up the price of a litre of petrol?
Roughly four components: the international cost of refined petrol (crude oil plus refining margin), shipping and freight to Australian terminals, government taxes (fuel excise plus 10% GST), and the wholesale-to-retail margin that covers distribution, retail overheads and competition-driven discounting.
How much of the petrol price is tax?
Federal fuel excise is indexed twice a year (in line with CPI) and sits above 50 cents per litre, with GST then applied at 10% on top of the fuel price plus excise. Combined, taxes typically make up around a quarter to a third of the total pump price, though the exact share moves as the underlying fuel price changes.
Why does petrol cost more in some suburbs than others?
Local competition is the biggest driver. Suburbs with several stations from different brands competing for the same customers tend to discount more aggressively than areas with fewer servos. Site costs, lease terms, traffic volume and whether a suburb sits inside a major retailer’s discount-voucher network also play a role.
Why is petrol cheaper in some cities than Melbourne?
Capital cities run independent retail cycles with different timing and depth of discounting. Perth, for example, has historically run a predictable weekly cycle, while Melbourne and Sydney cycles can be less regular. Freight distance from refineries and import terminals, plus the level of local competition, also shifts city-to-city averages.
Does the Australian dollar affect petrol prices?
Yes. Refined petrol is priced in US dollars on international markets, so when the Australian dollar weakens, importers and refiners pay more in local-currency terms for the same barrel — and that cost flows through to the bowser even if the US-dollar oil price has not moved.
Why is premium petrol more expensive than regular unleaded?
Premium grades (95 and 98 octane, sold as PUL95 and PUL98 in Australia) cost more to refine because they require additional processing to reach a higher octane rating, and they are typically produced and imported in smaller volumes than standard ULP 91, which reduces scale efficiency.
Is petrol more expensive in Australia than other countries?
It depends on the comparison. Australia’s fuel excise is lower than in many European countries, so Australian pump prices often sit below UK or European averages, but above lower-tax markets such as the United States. The International Energy Agency publishes comparative retail fuel price data across member countries.
Why did petrol prices spike this week?
Short-term spikes are usually a retail cycle reset, a local supply disruption, or a fast-moving international event affecting crude oil (such as a geopolitical disruption to a major shipping route). Compare today’s price against the recent weekly average on a live fuel price map before assuming it is a lasting trend.
Will petrol prices go down?
Petrol prices move in both directions. Within the weekly-to-fortnightly retail cycle, prices reliably fall during the discount phase after a reset. Over the medium term, prices fall when global oil supply increases relative to demand or when the Australian dollar strengthens — but no source can guarantee the timing.
When is the cheapest time to buy petrol?
The cheapest point is usually in the middle-to-late stage of the local discount phase, just before the next reset. Fuel price apps and live comparison tools that track your suburb’s recent price history are more reliable than fixed "best day of the week" rules, which vary by city and change over time.
How can I find the cheapest petrol near me?
Use a live fuel price comparison map or app that pulls from official state fuel price reporting schemes, filter by your suburb and fuel grade, and check prices on the day you plan to fill up rather than relying on memory — boards can move several cents within 24 hours during a reset.
Conclusion
Petrol is expensive in Australia because several costs stack on top of each other: the global price of crude oil and refined petrol, freight and shipping costs to get fuel to Australian terminals, the strength or weakness of the Australian dollar, federal fuel excise and GST, and the local retail margin that moves with competition and the price cycle. None of these is fixed, which is exactly why prices change as often as they do — and why the same question, “why is petrol so expensive today,” can have a slightly different answer each time you ask it.
The most useful thing you can do as a driver is separate what you can influence from what you cannot. You cannot move global oil markets or the exchange rate, but you can track your local price cycle, compare suburb-level prices before you fill up, and use the tips above to cut your annual fuel spend regardless of which direction global prices move next.
Ready to compare today's prices? Check current Melbourne fuel prices using the Petrol Prices Near Me live map and find the cheapest board near you before you fill up.
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Reference prices use a Melbourne metro public fuel snapshot (3 June 2026). Diesel reference: 193.5 c/L. Figures are illustrative — always confirm live prices before you fill up.