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Hi Autocar Team, I am planning to buy the Tata Harrier by selling my 2021 Tata Nexon petrol XZ+ (O) Dark Edition, which has covered 30,000 km. I am confused about whether to choose the Harrier petrol or diesel. With the government introducing stricter emission norms, will buying a diesel car be a viable option in the long run? If I choose diesel, should I go for the manual or automatic transmission? Which gearbox is more durable? If I choose petrol, can I expect decent mileage from such a heavy car? Please advise.
We would recommend the Harrier diesel automatic if you do substantial highway driving or cover over 15,000km annually. If your usage is mainly within the city and your annual running is low, the petrol automatic is worth considering, although its fuel bills will be considerably higher than those of your Nexon petrol.
The stricter emission norms coming into effect from April 2027 are fleet average fuel efficiency targets for manufacturers, not a ban on diesel cars. The diesel therefore remains a viable option, particularly if you intend to keep the Harrier for several years and regularly undertake long journeys. Fuel efficiency is the petrol Harrier's biggest drawback. In Autocar India's test, the petrol automatic returned 6.17kpl in the city and 12.49kpl on the highway, against 9.6kpl and 14.4kpl respectively for the diesel automatic.
The automatic is more convenient in traffic, while the manual diesel offers slightly better efficiency. Neither gearbox should be chosen on durability assumptions alone.

Tata Harrier
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@aniket_das After driving the Harrier, I felt the car is superb in driving dynamics, engine is very powerful for highways and robust build quality and safety and ride is very comfortable for long drives and car is also spacious with mileage of diesel engine very good. I am a proud owner of BS6 2021 Harrier.
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Posted on: 16 Oct 2026
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