Tata Sierra vs Kia Seltos mileage comparison — Which SUV gives you more per litre in 2026?

The Tata Sierra and Kia Seltos are two of the more talked-about compact SUVs in India right now. Both are offered with similar powertrain setups, including a naturally aspirated petrol, a turbo-petrol and a diesel, each available with multiple gearbox options. 

Mileage is one of the more grounded factors in an SUV purchase decision, and the ARAI numbers for both cars tell an interesting story. In some combinations the Seltos wins clearly. In others the Sierra holds its own. Here is a full engine-by-engine look at what the ARAI figures actually say.

Tata Sierra vs Kia Seltos NA petrol mileage

Both SUVs use a 1.5-litre naturally aspirated petrol engine. The power outputs are nearly identical, hovering around 115 PS.

The Tata Sierra edges out the Seltos in this category. The Sierra manual returns 17.40 kmpl against the Seltos's 16.5 kmpl on manual. Even on the automatic side, the Sierra DCT delivers 16.90 kmpl while the Seltos iVT stays at 16.5 kmpl. The gap is not dramatic, but it is consistent. The Sierra's ARGOS platform appears to have a slight efficiency advantage in the NA petrol configuration.

 Tata Sierra vs Kia Seltos turbo-petrol mileage

The new-gen Kia Seltos pairs its turbo-petrol with a 7-speed DCT, while the Sierra uses a 6-speed torque-converter automatic. The transmissions are fundamentally different in character and that shows in the mileage.

The Seltos turbo-petrol DCT delivers a notably better 17.5 kmpl against the Sierra's 15.30 kmpl on the torque-converter AT. DCT gearboxes tend to be more fuel-efficient than traditional torque converters because they do not use fluid coupling, which results in lower energy losses especially on highways. If fuel economy matters to you in a turbo-petrol, the Seltos DCT has a clear advantage here. The Seltos also offers a 6-speed iMT at 15.6 kmpl, which the Sierra does not match with a turbo-petrol manual option.

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Tata Sierra vs Kia Seltos diesel mileage: Tata Sierra vs Kia Seltos

Diesel is where the Sierra makes its strongest case for fuel efficiency. The 1.5L diesel in both cars develops broadly similar power but the Sierra claims stronger ARAI numbers, especially with the manual.

The Sierra diesel manual returns 21.26 kmpl against Seltos's 19.4 kmpl. That is a meaningful 1.86 kmpl difference on paper. On the automatic side the Sierra still leads at 19.22 kmpl versus 17.8 kmpl for the Seltos. If diesel mileage is your primary buying criterion, the Sierra has the upper hand in both transmission options, though real-world results in city traffic may close that gap considerably.

Which should you pick based on mileage?

If you are primarily a highway user who wants strong diesel mileage, the Tata Sierra diesel manual is the most fuel-efficient option among the two. If you want a turbo-petrol with good efficiency and prefer a DCT's response, the Kia Seltos is the smarter pick. For everyday city commuters on NA petrol, both are close but the Sierra has a marginal edge. The Sierra overall leads on diesel and NA petrol mileage while the Seltos wins decisively on the turbo-petrol automatic comparison.

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