I am planning to buy the Tata Sierra (top-end variant) and need advice on choosing between the petrol and diesel options. My usage is as follows: Daily driving: 50-60 km Long trips: around 400 km once every 2–3 months Location: Shirala, Maharashtra (mix of city, highway, and ghat roads) Considering mileage, maintenance, and long-term ownership costs, which engine would be better suited for my usage - turbo petrol or diesel? I would also appreciate insights based on real user experiences and practical ownership.

Autocar India

•3m

With 50-60 km every day, a 400 km trip every couple of months, and a mix of city, highway and ghat roads around Shirala, the Tata Sierra diesel in the top trim will suit you better than the turbo petrol. Your running is high, so the diesel will use less fuel day to day and, over a few years, the lower fuel bills usually make up for the higher buying price. On hilly roads, the diesel’s stronger pull at low speeds makes life easy - fewer gear changes, cleaner overtakes, and it feels more relaxed when the car is full of people or luggage.

There are a couple of points to know. A modern diesel has a soot filter in the exhaust - called a Diesel Particulate Filter (DPF). It needs regular warm runs to keep itself clean. Your daily 50-60 km should be enough, but those highway runs would be ideal for this. If you do many short, cold-start drives for a week or two, you may see a warning asking for a steady drive to clear it. The advantage of Tata's diesel is that it doesn't require AdBlue, as it uses a Lean NOx trap rather than a Selective Catalytic Reduction (SCR) system to manage NOx, so that's one less thing you'll have to keep in mind.

Pick the turbo petrol only if you value refinement above all else, and performance, which is much stronger than the diesel's. However, its fuel economy is nowhere near as good, and in our tests, we managed just 6.49kpl in the city and 13.7kpl on the highway.

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More questions on similar cars

Anil Gupta

•5d

Hi Autocar team, I own a 2015 Hyundai i20 Elite petrol manual. My average running is around 500 km per month. I am looking for a practical SUV that can accommodate a family of 5–7 members occasionally. This will be my last car, as I am 58 years old, and it will mostly be driven alone or with a co-passenger. I have looked at the Tata Sierra and Mahindra XUV 7XO. I am confused between electric and petrol, and also between manual and automatic. Please suggest.

Autocar India

•2d

With 500 km a month with at most you and one passenger (but sometimes 5-7 members), the Mahindra XUV 7XO petrol automatic in the 7-seat version is the better fit for you. It gives you a proper third row for those rare family trips, yet the rest of the time it works well as a calm, easy daily car.For your low running, petrol makes more sense than electric. Try to avoid the higher upfront price of an EV as you will not drive enough each month to recover that extra cost. The XUV’s petrol with the automatic gearbox that changes gears on its own will feel far easier than your i20 manual in stop-go traffic.A couple of trade-offs to note. The Mahindra car that you are considering, is big, so parking in tight spots needs some care. Also, the third row is best for kids or short adults on short trips but not during long highway stretches.Overall, for your usage and this being your last car, the XUV 7XO petrol automatic 7-seater lines up best.

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Govind

•4d

I have been driving diesel cars for the last 15 years, and my current car is a 2019 Skoda Rapid diesel. Now, I am planning to buy an SUV and am inclined towards the Tata Sierra Adventure petrol model. However, I am not sure whether to choose a manual or an automatic. My daily running is almost zero, and the car will be used only on weekends and for long-distance once every three months, covering around 1,200 km. I have also tried the Kia Seltos, but I felt the Sierra was better in terms of space and comfort.

Autocar India

•2d

Given your limited usage, it's really a matter of choice. An automatic takes away the effort in city traffic and reduces fatigue, whereas a manual gives you more control. You are moving up from a Skoda Rapid diesel manual to a bigger, taller SUV; the automatic will make parking, slow-speed moves and hill starts simpler, and the petrol will feel smoother and quieter at low speeds than your diesel. With almost zero daily running, the usual fuel and clutch-wear savings of a manual do not matter much, so it makes sense to buy the one that is easiest to live with.A couple of trade-offs to note: the automatic will cost more upfront and can use a bit more fuel than the manual. If you enjoy shifting gears yourself, the manual will give you more control on quick overtakes. With the Sierra, it also depends greatly on which petrol engine you choose. If you choose the more powerful 1.5-litre turbo petrol engine, we'd be more inclined to recommend the automatic, as the 6-speed torque converter is smooth and complements the engine well. However, this will be expensive. Instead, if you choose the 1.5-litre naturally aspirated engine, you're better off with the manual. The engine is not very powerful, and the 7-speed dual-clutch auto it comes with only amplifies this sensation, and thus with this engine, the manual gearbox is recommended.

Tata Sierra

Amit

•4d

I am planning to purchase a mid-segment SUV. The options I have tested include the Tata Harrier, Tata Sierra, and Kia Seltos. My budget is around ₹20 lakh. My driving will be primarily in the city, with occasional highway use. I am looking for the best option that offers steady performance along with good power. Additionally, I would like guidance on whether a diesel or petrol variant would be more suitable for my usage.

Autocar India

•2d

Pick the Kia Seltos petrol IVT if you are considering the naturally aspirated options. It is the best fit for your usage.The Seltos’ petrol engine feels more usable and refined, and the IVT gearbox is very smooth in city driving. It is easy to live with, consistent in traffic and suits your primarily urban usage perfectly. The power delivery is linear and predictable, which gives you the steady performance you are looking for without feeling stressed or jerky.Coming to the Tata Sierra, the naturally aspirated petrol is not a great match. It is a larger and heavier SUV, and the engine feels flat and underpowered for its size, especially in city conditions. However, if you are open to the turbo petrol version, the Sierra becomes a better option. The turbo engine feels stronger and more responsive, and the torque converter automatic is smoother and more robust for everyday use compared to a DCT.Between the Sierra and the Harrier, we would suggest going for the Sierra. It is the newer car, feels nicer to drive and offers the same turbo petrol engine with a smoother torque converter automatic option.

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