Hi Team, good day. I currently own a Tata Altroz petrol manual and am planning to change my car due to its poor mileage and low power. I am considering two options: the Maruti Suzuki Brezza VXi CNG and the Kia Sonet HTK(O) diesel manual, mainly for better mileage. My daily running is around 80km, with 20km in the city and 60km on the highway, about 4–5 days a week. I also travel to my hometown once every three months, covering around 800km on a round trip. Which of these two would be better suited to my usage? If CNG is the better option, can the Brezza be driven only on CNG for better mileage? Will regular CNG usage cause premature damage to the engine head or cylinder bore? I would also like to know about the service requirements and long-term reliability of both options. Additionally, will diesel-related restrictions or norms be implemented in Chennai as well? Please guide me on which car would be more suitable for my usage and whether these two are good choices.
With 80km a day and a mix of city and highway driving, the Kia Sonet diesel manual is the better fit. The diesel engine will give you strong fuel efficiency on the highway, good pulling power for overtakes and a more relaxed driving experience at higher speeds. The Sonet is also a more powerful and enjoyable car to drive than the Maruti Suzuki Brezza CNG, which will feel underpowered on highways and during overtakes.
CNG is best suited to city-heavy usage where fuel savings are maximised. On highways, the savings are not as significant, and refuelling with CNG also requires a bit of planning. You can run the car mostly on CNG, but it is recommended to run on petrol occasionally to keep the fuel system healthy. Modern factory-fitted CNG systems are reliable, and there are no widespread issues with head or bore damage when used as intended.
Go for the Sonet diesel manual. It will give you the best balance of power, efficiency and long-term suitability for your usage.
Kia Sonet
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@autocar.india thank you team for your feedback. I will think about it
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Posted on: 28 Aug 2026
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