Converting a car to run on LPG (liquefied petroleum gas) offers several benefits, but it also comes with notable drawbacks that are important to consider before making the decision. Here are the key disadvantages:
1. High Upfront Conversion Costs
Installing an LPG system is a significant initial investment. Costs typically range from $1,500 to $4,000 (or more), depending on:
The type of vehicle (e.g., older models may require more modifications).
The quality of the LPG kit (e.g., sequential injection systems are pricier but more efficient).
Labor fees from certified conversion centers.
This cost can take years to recoup through fuel savings—especially for low-mileage drivers (e.g., those driving <10,000 km/year).
2. Reduced Cargo/Boot Space
LPG requires a dedicated storage tank, which is usually mounted in the car’s boot (trunk) or under the vehicle. For most cars, this:
Occupies a significant portion of boot space (e.g., a typical 60-liter tank can reduce usable space by 30–50%).
May limit the ability to carry large items (e.g., luggage, sports equipment) or fold down rear seats.
Some larger vehicles (e.g., SUVs, vans) can accommodate underfloor tanks, but this is less common for smaller cars.
3. Limited Refueling Infrastructure
LPG is not as widely available as petrol or diesel in many regions. While countries like the UK, Australia, and parts of Europe have robust LPG station networks, others (e.g., rural areas in North America, Asia, or Africa) may have few or no stations. This can:
Force drivers to detour long distances to refuel, wasting time and fuel.
Create anxiety about running out of LPG during long trips.
4. Lower Fuel Efficiency
LPG has a lower energy density than petrol (about 25–30% less energy per liter). This means:
You’ll get fewer kilometers per liter (typically 10–15% less than petrol). For example, a car that gets 15 km/l on petrol might get 12–13 km/l on LPG.
More frequent refueling stops, even though each fill-up is cheaper than petrol.
5. Potential Impact on Vehicle Value and Warranties
Resale value: Modified vehicles with non-factory fuel systems may be less attractive to buyers, who may worry about the quality of the conversion or long-term reliability. This can lower resale prices.
Warranties: Converting a new car (still under manufacturer warranty) may void parts of the warranty, as many automakers do not cover modifications to the fuel or engine systems.
6. Safety Risks (If Poorly Installed)
While LPG is generally safe when handled properly, unqualified or cheap conversions pose risks:
Leaks in the tank or fuel lines can lead to fires or explosions.
Poorly calibrated systems may cause engine misfires, overheating, or increased emissions.
This underscores the need for certified installers, but even then, maintenance (e.g., regular tank inspections) adds minor ongoing costs.
7. Reduced Power (In Some Cases)
LPG burns slightly less aggressively than petrol, which can result in a marginal loss of engine power (5–10% in some vehicles). This is rarely noticeable in daily driving but may be felt during acceleration or when carrying heavy loads.
In summary, LPG conversion’s drawbacks primarily revolve around upfront costs, practical inconveniences (space, refueling), and long-term considerations (value, efficiency). These factors make it less suitable for low-mileage drivers, those in areas with limited LPG access, or owners of new/leased vehicles.
