The Tata Harrier and the Tata Sierra are two of the most talked-about SUVs in Tata’s line-up. Both now share the new 1.5-litre HYPERION turbo-petrol engine family, but they differ in size and diesel engine. The Harrier uses the 2.0-litre Kryotec diesel, while the Sierra uses a smaller 1.5-litre Kryojet diesel and also offers a 1.5-litre naturally aspirated petrol.
So, Harrier or Sierra, which is better for mileage? In this Tata Harrier vs Tata Sierra comparison, we look at ARAI-claimed and real-world mileage for each powertrain, along with specs, fuel costs and price, to help you decide.
Table of Contents
Tata Harrier vs Tata Sierra Specs
The specifications of the Tata Harrier and the Tata Sierra help explain the difference in their mileage. The table below sheds some light on this:
| Specification | Tata Harrier | Tata Sierra |
|---|---|---|
| Engine | 1.5-litre HYPERION Turbo-GDi petrol / 2.0-litre KRYOTEC turbo-diesel | 1.5-litre Revotron NA petrol / 1.5-litre HYPERION Turbo-GDi petrol / 1.5-litre Kryojet diesel |
| Displacement | Petrol: 1498 cc / Diesel: 1956 cc | NA petrol: 1498 cc / Turbo-petrol: 1498 cc / Diesel: 1497 cc |
| Power | Petrol: 170 PS / Diesel: 170 PS | NA petrol: 106 PS / Turbo-petrol: 160 PS / Diesel: 118 PS |
| Torque | Petrol: 280 Nm / Diesel: 350 Nm | NA petrol: 145 Nm / Turbo-petrol: 255 Nm / Diesel: 260–280 Nm |
| Transmission | Petrol and diesel: 6-speed MT, 6-speed AT | NA petrol: 6-speed MT, 7-speed DCA / Turbo-petrol: 6-speed AT / Diesel: 6-speed MT, 6-speed AT |
| Fuel tank capacity | 50 litres | 50 litres |
| Boot space | 445 litres | 622 litres |
The Harrier has the more powerful engines, with 170 PS from both its petrol and diesel, and a much larger 2.0-litre diesel with 350 Nm of torque. The Sierra offers a wider choice, including a naturally aspirated petrol, and its 1.5-litre diesel is smaller and lighter on fuel. Both SUVs use a 50-litre fuel tank, while the Sierra offers a much bigger boot. You can read more in our Tata Sierra vs Tata Harrier comparison. Let’s see the ARAI-claimed mileage figures of both these cars now.
Tata Harrier vs Tata Sierra: ARAI Claimed Mileage
ARAI mileage figures are usually higher than real-world mileage because the tests are carried out in a controlled environment under ideal conditions. Still, they are a useful benchmark for comparing cars. The claimed mileage of the Tata Harrier and Tata Sierra is given below:
| Engine & Transmission | Fuel Type | Tata Harrier – ARAI Mileage | Tata Sierra – ARAI Mileage |
|---|---|---|---|
| 1.5L NA Petrol – 6-Speed MT | Petrol | NA | 17.4 km/l |
| 1.5L NA Petrol – 7-Speed DCA | Petrol | NA | 16.9 km/l |
| 1.5L Turbo-Petrol – 6-Speed MT | Petrol | Not disclosed | NA |
| 1.5L Turbo-Petrol – 6-Speed AT | Petrol | Not disclosed | 15.3 km/l |
| Diesel – 6-Speed MT | Diesel | 16.8 km/l (2.0L) | 21.26 km/l (1.5L) |
| Diesel – 6-Speed AT | Diesel | 16.8 km/l (2.0L) | 19.22 km/l (1.5L) |
On paper, the Sierra is the more fuel-efficient SUV. Its 1.5-litre diesel claims 21.26 km/l with the manual and 19.22 km/l with the automatic, well ahead of the Harrier diesel’s 16.8 km/l. Tata describes the Harrier petrol as the most fuel-efficient in its segment but has not published an ARAI figure for it. Among the Sierra’s petrol options, the NA petrol manual claims the highest figure at 17.4 km/l.
Also Read: Complete Guide to Buying a Tata Harrier
Tata Harrier vs Tata Sierra: Real-World Mileage
Now, let’s see whether the claimed figures translate into real-world mileage. The real-world mileage for each powertrain of the Harrier and the Sierra is given below:
Tata Harrier (1.5L Turbo-Petrol) vs Tata Sierra (1.5L Turbo-Petrol)
| Driving Condition | Tata Harrier (1.5L Turbo-Petrol) | Tata Sierra (1.5L Turbo-Petrol) |
|---|---|---|
| City | Manual: 10 km/l / Automatic: 6.17 km/l | Automatic: 6.49 km/l |
| Highway | Manual: 15 km/l / Automatic: 12.49 km/l | Automatic: 13.70 km/l |
| Average | Manual: 12.50 km/l / Automatic: 9.33 km/l | Automatic: 10.10 km/l |
| Tank Range | 465–625 km | About 505 km |
Tata Harrier (2.0L Diesel) vs Tata Sierra (1.5L Diesel)
| Driving Condition | Tata Harrier (2.0L Diesel) | Tata Sierra (1.5L Diesel) |
|---|---|---|
| City | Manual: 10.80 km/l / Automatic: 9.60 km/l | Manual: 13 km/l / Automatic: 11.53 km/l |
| Highway | Manual: 15.30 km/l / Automatic: 14.40 km/l | Manual: 15.50 km/l / Automatic: 14.56 km/l |
| Average | Manual: 13.05 km/l / Automatic: 12.00 km/l | Manual: 14.25 km/l / Automatic: 13.05 km/l |
| Tank Range | 600–650 km | 650–710 km |
Tata Sierra (1.5L NA Petrol)
| Driving Condition | Tata Sierra (1.5L NA Petrol) |
|---|---|
| City | Manual: 7 km/l / DCA: 9 km/l |
| Highway | Manual: 12 km/l / DCA: 14 km/l |
| Average | Manual: 9.50 km/l / DCA: 11.00 km/l |
| Tank Range | 475–550 km |
With turbo-petrol automatics, the Sierra is slightly more efficient than the Harrier, averaging 10.10 km/l against 9.33 km/l. Both struggle in heavy city traffic, where they return only around 6–6.5 km/l. The Harrier petrol manual is a better choice for efficiency, averaging around 12.50 km/l. Read our Tata Harrier real-world mileage guide for more detail.
In diesel form, the Sierra’s smaller 1.5-litre engine is more efficient across the board. The Sierra diesel automatic averages 13.05 km/l against the Harrier diesel automatic’s 12.00 km/l, and the gap is largest in the city (11.53 vs 9.60 km/l). The Harrier diesel still has the advantage in torque, which helps on long highway runs with a full load. The Sierra’s NA petrol option has no Harrier equivalent and suits buyers with low monthly running.
Also Read: Tata Sierra Real World Mileage
Tata Harrier vs Tata Sierra: Fuel-Cost Comparison
The monthly, yearly and 5-year fuel costs of the Harrier and the Sierra show how their real-world mileage affects running costs. For reference, we have assumed that both cars run 1,500 km per month. Delhi fuel prices as of 26 October 2026, petrol (₹102.12 per litre) and diesel (₹95.20 per litre), are used to calculate the fuel costs:
| Cost Head | Harrier Turbo-Petrol AT | Sierra Turbo-Petrol AT | Harrier Diesel AT | Sierra Diesel AT |
|---|---|---|---|---|
| Monthly Running | 1,500 km | 1,500 km | 1,500 km | 1,500 km |
| Real-World Avg Efficiency | 9.33 km/l | 10.10 km/l | 12.00 km/l | 13.05 km/l |
| Monthly Fuel Use | 160.8 L | 148.5 L | 125.0 L | 114.9 L |
| Average Monthly Cost | ₹16,418 | ₹15,166 | ₹11,900 | ₹10,943 |
| Average Yearly Cost | ₹1.97 lakh | ₹1.82 lakh | ₹1.43 lakh | ₹1.31 lakh |
| 5-Year Fuel Cost | ₹9.85 lakh | ₹9.10 lakh | ₹7.14 lakh | ₹6.57 lakh |
The Sierra is cheaper to run with both fuels. With turbo-petrol automatics, it saves about ₹1,250 a month, or roughly ₹75,000 over five years. With diesel automatics, it saves about ₹960 a month, or roughly ₹57,000 over five years. For high-mileage users, either diesel saves ₹2.5–2.7 lakh over five years compared with the turbo-petrols. Fuel prices vary by city, so recalculate using your local rates.
Tata Harrier vs Tata Sierra Price
Let’s compare the ex-showroom prices of the Tata Harrier and the Tata Sierra:
| Model | Variant (Base to Top) | Price (Ex-Showroom) |
|---|---|---|
| Tata Harrier | Smart to Fearless Ultra | From ₹12.99 lakh (up to about ₹27 lakh) |
| Tata Sierra | Smart+ to Accomplished+ | From ₹11.49 lakh (up to about ₹22 lakh) |
The Sierra starts around ₹1.50 lakh lower than the Harrier and is also cheaper to run. The Harrier costs more but offers more powerful engines, a bigger 2.0-litre diesel and feature-rich top variants. The Sierra variant line-up includes the most affordable NA petrol option of the two.
Also Read: Comprehensive Guide for Buying Tata Sierra
Summary
When we compare the Harrier and the Sierra across powertrains, the Sierra comes out ahead on mileage. Its turbo-petrol automatic is slightly more efficient than the Harrier’s, and its 1.5-litre diesel delivers better mileage than the Harrier’s 2.0-litre diesel in both city and highway driving.
The Sierra is also cheaper to buy and run, and it offers an NA petrol option for buyers who drive less. However, both turbo-petrol automatics return low mileage in heavy city traffic, so the diesel remains the better choice for high monthly running.
Therefore, if you want lower running costs, a bigger boot and a lower starting price, the Sierra is a great choice. If you want more power, a stronger 2.0-litre diesel for long highway trips and a bigger, more commanding SUV, the Harrier justifies its higher price.
FAQs
Q. Which has better mileage, the Tata Harrier or the Tata Sierra?
The Sierra has better mileage. In real-world driving, the Sierra diesel automatic averages about 13.05 km/l against 12.00 km/l for the Harrier diesel automatic, and the Sierra turbo-petrol automatic averages 10.10 km/l against 9.33 km/l for the Harrier.
Q. What is the ARAI mileage of the Tata Harrier?
The Harrier 2.0-litre diesel claims 16.8 km/l with both the manual and automatic. Tata has not published an ARAI figure for the Harrier petrol.
Q. Do the Harrier and Sierra use the same petrol engine?
Both use a 1.5-litre HYPERION Turbo-GDi petrol engine. It makes 170 PS and 280 Nm in the Harrier and 160 PS and 255 Nm in the Sierra.
Q. Which diesel is more efficient, the Harrier or the Sierra?
The Sierra’s 1.5-litre Kryojet diesel is more efficient, both on paper (up to 21.26 km/l) and in real-world driving (13.05–14.25 km/l). The Harrier’s 2.0-litre Kryotec diesel averages 12.00–13.05 km/l but offers more power and torque.
Q. What is the fuel tank capacity of the Harrier and the Sierra?
Both the Harrier and the Sierra have a 50-litre fuel tank.
Q. Which is cheaper to run, the Harrier or the Sierra?
The Sierra is cheaper to run. At Delhi prices and 1,500 km a month, the Sierra diesel AT costs about ₹10,943 a month against ₹11,900 for the Harrier diesel AT.
Q. Does the Tata Sierra have a naturally aspirated petrol engine?
Yes. The Sierra offers a 1.5-litre Revotron NA petrol engine with 106 PS and 145 Nm, available with a 6-speed manual or 7-speed DCA. The Harrier does not offer an NA petrol.
