Nowadays, buying a car has become a big decision. Especially when it comes to fuel option. Diesel and CNG are two popular fuel options, especially in cities like Delhi. Diesel cars are known for their durability and long range capability, whereas CNG cars are known for their cheap running costs and eco-friendly nature.
In such a situation the question arises that which option is better for you? It depends on your driving pattern, budget and needs. The price of diesel in Delhi in February 2026 is approximately ₹ 87.67 per liter, while the price of CNG is ₹ 77.09 per kg. Let us know about these two, so that you can take the right decision.
Price and running costs
First of all let's talk about running cost. The main advantage of CNG cars is their low cost. For example, an average CNG car gives a mileage of 25-30 km per kg. If you drive 1 km, the cost of CNG is approximately ₹ 2.77.
At the same time, diesel cars give mileage of 20-25 km per liter. The running cost of diesel is around ₹ 3.90 per km. If you drive 20,000 km annually, CNG will cost you ₹ 55,400, while diesel will cost you around ₹ 78,000. This means CNG will save ₹ 22,600 annually. However, the starting price of CNG cars is slightly higher than diesel. For example, the price of Tata Punch CNG starts from ₹ 7.3 lakh, while the diesel variant may be slightly cheaper.
Mileage and performance
CNG is ahead in terms of mileage. Popular cars like Maruti Swift CNG gives 32.85 km/kg, while diesel is better on the highway, like Hyundai Venue diesel gives 24 km/l. However, CNG has less power. Like 100hp in Nexon CNG, but more torque is available in diesel. If you drive a lot on the highway or carry heavy load, then diesel is a better option. At the same time, high mileage of CNG is beneficial for traffic in the city. In real-world tests, Tata Altroz CNG gives 25.11 km/kg, which is better than diesel's 24.2 km/litre.
Maintenance and servicing
Diesel cars are expensive in maintenance. Due to the complex parts of diesel engine, spare parts and service cost is high. This may cost Rs 10 to 15 thousand annually. Maintenance is a little more in CNG cars because the kit needs to be checked. Like frequent servicing of spark plugs and filters.
Overall, if your running is more than 15,000 km, then the savings on CNG cover the maintenance. The life of CNG engine is like petrol, but there is less wear and tear than diesel. However, CNG may require more maintenance after a year if the running is less. There is good availability of CNG stations in Delhi, but diesel is easily available everywhere.
Environment and other factors
CNG is cleaner from environmental point of view. Lower emissions, such as CO2 and particulate matter. Diesel causes more pollution, due to which diesel cars are being banned in many cities. CNG cars are the most eco-friendly option after EV in 2026. Boot space is less in CNG because of the tank, whereas there is no problem in diesel. Diesel is better in resale value if the car is in good condition, but demand for CNG is increasing. If your running is less (10,000 km/year), then diesel is of no use because maintenance will be more. At the same time, CNG gives 20-30% savings in long running.
Which one is right for you?
If you drive a lot in the city, want low running costs and care about the environment, then CNG is better. Like Maruti Ertiga CNG or Tata Nexon CNG. If you want long trips, more power and torque, then choose diesel. Like Kia Sonet Diesel. Overall, the benefits of CNG are more visible in 2026. Especially in Delhi where CNG infrastructure is strong. Before buying a car, take a test drive and calculate your budget.