Is LPG conversion still worth it in 2026?
Petrol is sitting above $2.00 a litre in Melbourne and shows no sign of dropping. If you drive a lot, especially around Tullamarine and the airport corridor, you’ve probably wondered whether there’s a cheaper way to fill up.
LPG conversion is one option. It’s been around for decades, it’s still available, and it costs roughly half the price of petrol per litre. But the market has changed since LPG’s peak years. Fewer stations sell it, no manufacturer offers it from the factory, and government rebates ended over a decade ago. So is it still a smart move in 2026, or has the window closed?
The short answer: for some drivers it still saves serious money. For others, it doesn’t make financial sense. Here’s how to work out which camp you fall into.
What does an LPG conversion involve?
An LPG conversion adds a second fuel system to your car. You keep your existing petrol system and gain the ability to run on LPG as well. Most conversions are dual-fuel, meaning you can switch between petrol and LPG with the flick of a switch.
The conversion includes fitting an LPG tank (usually in the boot or underneath the vehicle), running fuel lines, and installing either a vapour phase injection (VPI) or liquid phase injection (LPI) system.
Vapour phase injection is the more common and more affordable option. The liquid LPG passes through a converter that turns it into gas before it enters the engine. It’s reliable and suits most everyday vehicles.
Liquid phase injection feeds liquid LPG directly into the intake, where it vaporises. It’s more efficient and produces more power, but costs more to install. LPI systems are typically fitted to performance or high-km applications.
The conversion takes one to two days depending on the vehicle and system type. Not every car is suitable. Your mechanic will check engine compatibility, available space for the tank, and the overall condition of the vehicle before recommending a system.
How much does an LPG conversion cost?
Conversion costs in Australia generally fall between $2,000 and $4,500 depending on the vehicle, the type of system, and the complexity of the install. A straightforward VPI conversion on a common four-cylinder or six-cylinder vehicle sits at the lower end. LPI systems, V8s, or vehicles that need custom tank fabrication push toward the higher end.
There are no government rebates for LPG conversions in 2026. The federal LPG Vehicle Scheme ended in 2014, and nothing has replaced it. The full cost comes out of your pocket.
When does the maths work?
This is the question that matters. LPG is cheaper per litre, but your engine uses more of it. LPG produces less energy per litre than petrol, so fuel consumption increases by roughly 10 to 15 per cent.
Here’s how the numbers play out at different annual distances, using a vehicle that does 10 L/100 km on petrol (11.5 L/100 km on LPG) and current Melbourne averages of approximately $2.25/L for unleaded and $0.90/L for LPG:
| 10,000 km/year | 15,000 km/year | 25,000 km/year | |
|---|---|---|---|
| Annual petrol cost | $2,250 | $3,375 | $5,625 |
| Annual LPG cost | $1,035 | $1,553 | $2,588 |
| Annual saving | $1,215 | $1,822 | $3,037 |
| Break-even on $3,000 conversion | ~2.5 years | ~20 months | ~12 months |
Fuel prices fluctuate. These figures use Melbourne averages as of April 2026 and are indicative only.
The pattern is clear: the more you drive, the faster the conversion pays for itself.
The sweet spot: LPG conversion makes the strongest financial case for drivers covering 20,000 km or more per year in a vehicle they plan to keep for at least another three to five years. Rideshare drivers, airport shuttle operators, couriers, and tradespeople who clock up high kilometres along the Tullamarine Freeway and Western Ring Road corridors are the ideal candidates.
Can you still find LPG stations?
This is the most common concern, and it’s a fair one. The network has shrunk. Western Australia has lost most of its LPG stations. Some rural areas have limited coverage.
But Victoria is the strongest state for LPG availability, with over 600 stations still selling it. Metro Melbourne has good coverage, and you can drive from Melbourne to Cairns on LPG if you plan your stops. The Tullamarine and Essendon area has multiple LPG outlets along the main arterials.
That said, you do need to be more deliberate about where you fill up. A quick check on an LPG locator app before a long drive is a sensible habit. And for everyday driving around Melbourne’s northern and western suburbs, finding LPG is not a problem.
What are the honest downsides?
LPG isn’t the right choice for every car or every driver. Here’s what to weigh up:
Boot space. The LPG tank takes up room. A cylinder tank in the boot typically costs you 60 to 80 litres of cargo space. Toroidal (doughnut-shaped) tanks sit in the spare tyre well but mean giving up your spare. If boot space matters to you, this is a genuine trade-off.
Slight power reduction. On a VPI system, you’ll notice a small drop in power compared to running on petrol. Most drivers don’t find it significant in everyday driving, but it’s there. LPI systems largely eliminate this difference.
Fewer mechanics do LPG work. As the number of LPG vehicles has declined, so has the number of workshops equipped to service them. You need a licensed LPG installer for the conversion and a mechanic familiar with gas systems for ongoing servicing. This isn’t a problem if you know where to go, but it does limit your options.
Resale impact. Some buyers see an LPG system as a bonus. Others see it as a complication. On high-km commercial vehicles, it’s generally a positive. On a family car, the market is less enthusiastic.
Tank recertification. Under Australian Standard AS1425, LPG tanks must be inspected and pressure-tested every 10 years by an approved test station. If you’re buying a car with an existing LPG system, check when the tank was last certified.
Where does LPG sit next to hybrids and EVs?
LPG, hybrids, and electric vehicles all reduce your running costs compared to straight petrol. But they suit different situations and different budgets.
| LPG conversion | Hybrid (new) | Electric vehicle (new) | |
|---|---|---|---|
| Upfront cost | $2,000–$4,500 (on existing car) | $35,000–$55,000+ | $45,000–$70,000+ |
| Fuel/energy cost per km | ~$0.10/km | ~$0.06–$0.08/km | ~$0.03–$0.05/km |
| Best suited for | High-km drivers keeping an existing petrol car | New car buyers wanting savings with no range concerns | New car buyers with home charging, mostly urban driving |
| Refuelling | 600+ stations in VIC, shrinking nationally | Petrol stations everywhere | Growing but still limited for long-distance |
| Ongoing maintenance | LPG system service + standard car service | Standard car service (often lower brake wear) | Minimal mechanical maintenance |
Cost-per-km figures are approximate and based on current Melbourne fuel/energy prices.
If you’re buying a new car and fuel cost is the priority, a hybrid or EV is the better long-term investment. Factory-fitted systems, manufacturer warranties, and improving infrastructure make them the default choice for new vehicle buyers.
If you already own a petrol vehicle with years of life left and you’re not ready to replace it, LPG conversion can deliver savings that a hybrid or EV purchase can’t match in the short term. A $3,000 conversion on an existing vehicle is a very different financial proposition from a $40,000+ new car.
LPG makes the most sense as a practical solution for a specific situation: you have a reliable petrol vehicle, you drive a lot, and you want to cut your fuel bill without buying a new car.
What LPG servicing does your car need?
An LPG system adds a small amount of ongoing maintenance to your regular service schedule. This includes:
Filter replacement every 10,000 to 15,000 km or annually. LPG systems have vapour and liquid phase filters that need changing to keep the system running cleanly.
System inspection for leaks, hose condition, and connection integrity. This should be done as part of your regular car service by a mechanic who knows LPG systems.
Converter servicing. The vapouriser (on VPI systems) needs periodic attention to keep running efficiently. Your mechanic will check it during routine servicing.
Tank recertification every 10 years, as mentioned above. The cost for a tank retest runs between $200 and $700 depending on the tank type and location.
None of these add major cost. Rolled into your regular services, LPG maintenance is a modest expense that’s easily offset by the fuel savings.
Is it right for your vehicle?
LPG conversion suits some vehicles better than others. Four-cylinder and six-cylinder petrol engines are the most straightforward conversions. Older, simpler engine designs tend to work well with LPG systems.
Some newer vehicles with complex engine management systems, direct injection, or turbocharging are harder to convert and may not produce the same fuel savings. Diesel vehicles can’t be converted to LPG through a standard dual-fuel system.
The best way to find out is to have your vehicle assessed by a licensed LPG mechanic who can check compatibility, recommend a system, and give you a realistic cost estimate based on how you use your car and how far you drive.
Frequently asked questions
How much does LPG conversion cost in Melbourne?
A standard dual-fuel conversion in Melbourne ranges from $2,000 to $4,500 depending on the vehicle type and system. VPI conversions on common four-cylinder and six-cylinder engines sit at the lower end. LPI systems, V8s, and vehicles requiring custom work cost more.
Is LPG still available at petrol stations in Melbourne?
Yes. Victoria has over 600 stations selling LPG, and metro Melbourne has good coverage. The network has shrunk from its peak, but Melbourne remains one of the best-served cities in Australia for LPG availability.
How many kilometres before an LPG conversion pays for itself?
It depends on how much you drive and current fuel prices. At 25,000 km per year with a $3,000 conversion, most drivers break even within about 12 months. At 15,000 km per year, break-even stretches to roughly 18 months. Below 10,000 km, expect two to three years.
Does LPG damage your engine?
No. LPG burns cleaner than petrol and leaves less residue in the combustion chamber, which can reduce carbon buildup and extend engine life. The key is having the system properly installed by a licensed fitter and serviced regularly.
Can any car be converted to LPG?
Not all vehicles are suitable. Most four-cylinder and six-cylinder petrol engines convert well. Some newer engines with direct injection or turbocharging are more complex or unsuitable. Diesel engines can’t be converted through a standard dual-fuel system. A licensed LPG mechanic can assess your vehicle’s compatibility.
