The Tata Sierra is a very desirable choice thanks to its striking design, generous features, and rich, premium-feeling cabin. It’s a car that instantly feels a class above. The 1.5 NA engine, however, makes only 106hp. While that’s adequate for everyday driving, the problem lies more with the gearboxes it’s paired to — the 6-speed manual and the twin-clutch automatic aren’t the smoothest, and they don’t deliver the effortless power delivery you’re expecting in a car at this price.
The 160hp 1.5 turbo-petrol, on the other hand, is a much stronger, far smoother unit. Crucially, it’s paired with a 6-speed torque-converter automatic, and this combination is among the smoothest and most refined in the segment. It genuinely enhances the Sierra’s premium positioning.
Yes, the TGDi versions are priced higher, but Tata is offering a long feature list to justify the premium. Given your budget flexibility and your preference for comfort and practicality, we feel it’s worth stretching for the turbo-petrol. It suits the Sierra’s character far better and will make ownership more satisfying in the long run. 
