CNG vs Petrol: Which Is Better for Your Car?

Running Costs

The single biggest reason car owners switch to CNG is running cost. CNG is typically priced significantly lower per kilogram than petrol per litre, and since a kilogram of CNG covers roughly the same distance as a litre of petrol (sometimes more, depending on the vehicle), the per-kilometre fuel cost usually drops noticeably after conversion.

The exact savings depend on your vehicle, driving style and local fuel prices, so it is worth working out your own numbers before deciding — our savings calculator on the homepage gives a quick estimate based on your daily driving.

Mileage and Performance

A well-installed CNG kit with genuine components is designed to preserve most of your engine's normal driving feel, though some owners notice a small dip in peak power on CNG compared to petrol — this is normal and expected with retrofitted systems.

Mileage on CNG depends heavily on the quality of the kit, correct tuning, and regular servicing. Poorly maintained systems lose efficiency over time, which is why periodic servicing matters as much as the initial installation.

Maintenance Differences

CNG vehicles need a few maintenance items petrol-only cars do not — periodic checks of the cylinder, reducer, injectors and wiring, plus leak checks. None of this is complicated, but it does mean sticking to a servicing schedule rather than ignoring the system once it is fitted.

Which Should You Choose?

If you drive high daily distances, CNG conversion tends to pay for itself faster. If you drive occasionally, the savings take longer to offset the installation cost. Either way, the safety and quality of the installation matters more than the fuel choice itself.

• High daily mileage (cabs, delivery, long commutes) → CNG usually makes strong financial sense
• Occasional or short-distance driving → weigh installation cost against your annual savings first
• Always prioritise genuine components and a professional fitting over the cheapest quote