Tata Sierra iCNG Spotted Testing: The Legend Prepares to Return in a Green Avatar!

The Indian automotive landscape is buzzing with anticipation as Tata Motors gears up to resurrect one of its most legendary and beloved badges: the Tata Sierra. Initially showcased as a concept at the 2020 Auto Expo and later in a near-production avatar at the 2023 Auto Expo, the Sierra has been one of the most highly anticipated upcoming vehicles in India. While we already knew that the SUV would debut with both Electric Vehicle (EV) and Internal Combustion Engine (ICE) powertrains, a brand-new development has sent shockwaves through the industry.

A heavily camouflaged test mule of the Tata Sierra iCNG has been spotted testing on Indian roads for the first time. This exciting revelation signals Tata Motors' aggressive push to democratize green mobility by offering factory-fitted CNG kits in its premium SUV lineup, leveraging its highly successful, patented twin-cylinder technology.

Let’s dive deep into what we can expect from this upcoming iconic SUV, analyzing the design, powertrain options, expected variants, and its potential market launch.

The Return of an Icon: A Brief History

To understand why the automotive community is thrilled about the Sierra's return, we have to look back to 1991. The original Tata Sierra was a trailblazer. It was the first true lifestyle SUV designed and produced entirely in India. With its bold three-door configuration, massive signature curved rear glass pane (alpine windows), and comfortable cabin, it was way ahead of its time.

With the upcoming iteration, Tata is preserving the soul of the original Sierra while updating it with a modern five-door platform, ultra-luxurious interiors, cutting-edge technology, and environmentally conscious powertrains, including the newly spotted iCNG system.

Spy Shots & Design Aesthetics: What Was Spotted?

Despite the heavy camouflage on the test mule spotted recently near Tata's Pune manufacturing facility, several key design details have emerged that confirm this is indeed the upcoming Sierra:

• The Silhouette: The test mule retains the upright, boxy stance showcased on the 2023 Sierra concept. This boxy aesthetic ensures maximum cabin space while delivering a commanding road presence.

• Modern Tribute to Alpine Windows: A closer look at the side profile reveals a blacked-out C-pillar and rear quarter glass panel designed to mimic the wrap-around signature look of the classic Sierra.

• LED Lighting Signature: Up front, we can see a sleek, full-width LED light bar sitting above a revised grill. The main headlamp cluster is positioned lower down on the bumper, aligning with Tata's modern design language seen on the new Safari, Harrier, and Curvv.

• Rear Profile: The rear features a high-mounted stop lamp, a prominent roof spoiler, and sleek connected LED tail lamps that accentuate the vehicle's width.

Under the Hood: The iCNG Twin-Cylinder Revolution

Tata Motors has revolutionized the CNG segment in India with its patented twin-cylinder technology. Traditionally, choosing a CNG vehicle meant sacrificing the entirety of your boot space. Tata solved this by using two smaller cylinders tucked neatly under the luggage area floor, keeping the boot highly usable.

For a premium vehicle like the Sierra, Tata is expected to raise the bar. Instead of the standard 1.2-litre naturally aspirated engine found in smaller models, the Sierra iCNG is rumored to be paired with either the robust 1.2-litre turbo-petrol engine or the brand’s state-of-the-art, upcoming 1.5-litre direct-injection turbo-petrol engine.

Expected Engine & Performance Specifications

Below is an estimated look at the powertrain specifications for the upcoming Tata Sierra iCNG:

• Engine Option: 1.5L Direct-Injection Turbo-Petrol / iCNG

• Max Power (Petrol Mode): ~170 PS @ 5,000 RPM

• Max Power (CNG Mode): ~145 PS @ 5,000 RPM

• Max Torque (Petrol Mode): ~280 Nm @ 1,750 - 3,000 RPM

• Max Torque (CNG Mode): ~240 Nm @ 1,750 - 3,000 RPM

• Transmission Options: 6-speed Manual / 6-speed Torque Converter Automatic

• CNG Tank Capacity: 60 Litres (Water equivalent capacity split into twin cylinders)

• Boot Capacity: ~380 Litres (With twin cylinders cleverly packaged)

• Expected Mileage: ~16-18 km/kg

Tata’s ability to offer an automatic transmission with its iCNG lineup (as seen on the Tiago and Tigor) means the Sierra iCNG could very well become the first premium mid-size SUV in India to offer a Turbo-Petrol CNG Automatic combination.

Interior, Comfort, & Features: The "Lounge" Concept

At the 2023 Auto Expo, Tata showcased the Sierra with a unique "Lounge" seating configuration, featuring rotatable seats, immense legroom, and premium materials. While the production model will heavily feature a standard 5-seater layout, a premium 4-seater Lounge variant is highly anticipated.

Key Cabin Highlights:

• Dual-screen Layout: A 12.3-inch ultra-smooth touchscreen infotainment system by HARMAN paired with a 10.25-inch fully digital instrument cluster.

• Advanced Connectivity: Wireless Android Auto, Apple CarPlay, and Tata’s iRA 2.0 connected car suite.

• Premium Sound: A bespoke 9-speaker JBL sound system with a dedicated subwoofer.

• Lounge Experience: Panoramic sunroof (or dual sunroof segments to preserve the body structure), ambient mood lighting, ventilated front and rear seats, and executive rear reclining chairs.

• Safety First: Expected to secure a 5-star Bharat NCAP rating with 6 airbags as standard, Electronic Stability Control (ESC), 360-degree high-definition camera, and a full Level 2 ADAS (Advanced Driver Assistance Systems) suite.

Variant, Positioning, and Estimated Pricing

Tata Motors is expected to position the Sierra above the Curvv and slightly below the Harrier in its product portfolio. The iCNG variants will cater to buyers looking for premium SUV luxury and size, without the high running costs associated with traditional petrol/diesel powertrains.

Expected Price Range (Ex-Showroom India):

• Smart (Base variant): INR 15.50 Lakhs

• Pure (Mid variant): INR 17.20 Lakhs

• Creative (Tech-focused variant): INR 19.50 Lakhs

• Fearless / Fearless+ (Top-spec luxury): INR 21.80 Lakhs

• Lounge Edition (Exclusive 4-seater): INR 23.50 Lakhs

Key Takeaways of the Tata Sierra iCNG

• Nostalgic Masterstroke: Revives a legendary design heritage with iconic alpine-style rear glass housing.

• No Boot Space Compromise: Tata’s industry-first twin-cylinder setup ensures that even as a CNG vehicle, you have plenty of room for family road trips.

• Premium Performance: Expected to carry a powerful 1.5L turbo-petrol engine, eliminating the sluggishness traditionally associated with CNG vehicles.

• Unmatched Tech: Level 2 ADAS, ventilated seats, premium lounge configuration, and massive digital displays.

Final Verdict: Will it Disrupt the Premium SUV Segment?

By introducing a premium CNG option to the Sierra, Tata Motors is playing a masterstroke. The mid-size and D-segment SUV spaces are currently dominated by heavy-hybrid, diesel, and petrol models. A factory-fitted, turbo-petrol automatic iCNG SUV with uncompromised boot space and legendary branding will offer a uniquely compelling proposition for Indian families.

With testing underway, we expect the Tata Sierra iCNG to debut in late 2025 alongside its EV counterpart. Stay tuned to AutoThrust India for more exclusive spy shots, technical analysis, and launch updates!