CNG Has Overtaken Diesel in India: Can It Become the New Diesel?

Diesel was once the obvious choice for people who drove long distances. Its strong torque, good fuel economy and long driving range made it popular among high-mileage users, particularly those buying sedans, SUVs and seven-seater cars.

However, the Indian passenger vehicle market is changing. Petrol engines are becoming more efficient, CNG is gaining popularity, hybrids are getting better and electric cars are becoming more capable. In a significant shift, CNG passenger vehicle sales have now moved ahead of diesel.

But does this mean CNG can become the new diesel for high-mileage car users?

CNG Sales Move Ahead of Diesel

CNG accounted for 21.98 per cent of India’s passenger vehicle sales in FY2026, compared with 18.08 per cent for diesel. More than 10 lakh CNG passenger vehicles were sold during the financial year. The change is even more significant when compared with a few years ago. CNG had a passenger vehicle market share of around 12-13 per cent just three years ago. The main reason behind this growth is simple: running costs. CNG allows customers to reduce fuel expenses without requiring a major change in how they use their cars.

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Why CNG Is Becoming Popular

CNG cars offer the convenience of an internal-combustion engine while keeping fuel costs relatively low. This makes them particularly attractive to customers who cover high annual kilometres. Maruti Suzuki has built one of the largest factory-fitted CNG portfolios in India. Tata Motors and Hyundai also offer CNG options across select models, while Kia has entered the segment with the Carens and Carens Clavis. For customers who do not have easy access to EV charging, CNG can offer a simpler alternative for reducing running costs.

CNG Still Has Some Limitations

CNG may have overtaken diesel in terms of market share, but it does not offer the same experience as a diesel powertrain in every situation. CNG cars can have less boot space because of the gas tank, while performance may not match an equivalent petrol or diesel version. The experience also depends heavily on the availability of CNG stations. This becomes more important as the size of the vehicle increases. A large SUV covering 20,000-30,000km a year could benefit from lower CNG running costs, but fitting a large CNG tank while maintaining luggage space and performance can be challenging.

What About Hybrids?

Strong hybrids could become another major alternative to diesel, especially in larger SUVs and family cars. A hybrid combines a petrol engine with an electric motor and battery, allowing the car to use electric power under certain conditions. This can improve fuel efficiency without requiring the owner to plug the vehicle into a charger. The downside is the higher purchase price. Hybrid technology can add significantly to the cost of a vehicle, which limits its appeal in more affordable segments.

Plug-In Hybrids and Range-Extender EVs

Plug-in hybrids and range-extender EVs could offer an even closer replacement for diesel in the future. These powertrains can provide electric driving for shorter journeys while using an engine for longer trips. In theory, this could offer the low running costs of an EV with the long-distance convenience of a petrol or diesel car. However, the technology is still expensive. As a result, it is more likely to become popular in larger and premium vehicles before reaching affordable segments.

EVs Are Another Alternative

Electric vehicles are also becoming a stronger option for high-mileage users. They can offer lower running costs and newer models are increasingly delivering longer driving ranges and faster charging. However, charging infrastructure remains an important factor. For people who regularly travel long distances or do not have access to home charging, an EV may not yet offer the same convenience as a CNG, petrol or diesel car.

CAFE III Norms Could Accelerate the Shift

The upcoming CAFE III norms are also expected to influence the powertrain choices made by car manufacturers. The new fuel-efficiency targets will progressively tighten from April 2027 through 2032. The regulations do not mean that diesel cars will disappear. However, they will put greater pressure on manufacturers to improve the overall efficiency of their vehicle portfolios. This could encourage more carmakers to invest in CNG, hybrid, plug-in hybrid and electric powertrains.

Can CNG Really Become the New Diesel?

CNG has already taken an important step by overtaking diesel in India’s passenger vehicle market. However, it is unlikely to completely replace diesel across all segments. CNG could become the affordable high-mileage alternative for smaller cars, compact SUVs and MPVs. Strong hybrids, plug-in hybrids and range-extender EVs could play a bigger role in larger and more expensive vehicles, while EVs will continue to grow as charging infrastructure improves. Diesel, meanwhile, still has an advantage for customers who prioritise highway efficiency, long-distance range and strong performance. It may become less common in the coming years, but it is unlikely to disappear immediately.

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