Tata Sierra mileage figures revealed via RTI, differ sharply from earlier claims

Fuel-efficiency details of the Tata Sierra have emerged months after its debut, clearing the air about its certified economy figures. An RTI response from ARAI recently shared by Vahan Warta on X revealed that the 1.5-litre TGDi Hyperion petrol engine delivers 13.5 kmpl. The other engine, the 1.5-litre Kryojet diesel, is rated at 18.8 kmpl.

Meanwhile, the naturally aspirated petrol variant is yet to receive certification. The diesel engine was certified on 21 November 2025, followed by the turbo-petrol on 11 December 2025.

Tata Sierra ARAI-certified mileage revealed:

✅ 1.5L TGDi Hyperion Petrol – 13.5 km/l
✅ 1.5L Kryojet Diesel – 18.8 km/l
✅ 1.5L NA Petrol – Not yet certified
📌 RTI Filed: 26/11/2025
📌 RTI Closed: 19/12/2025 (Request Disposed – ARAI)

Sierra owners - What real-world mileage… pic.twitter.com/lsm3YGQpsJ

— Vahan Warta (वाहन वार्ता ) (@VahanWarta) March 24, 2026

Claimed vs certified figures

These numbers are significantly lower than the earlier 29.9 kmpl figure recorded for the turbo-petrol engine under controlled testing conditions at NATRAX. That claim drew attention for exceeding even hybrid-vehicle efficiency figures, though it was not based on ARAI testing.

Even without confirmed mileage figures at launch, the Sierra has recorded strong demand. Deliveries began on 15 January 2026, with over 10,000 units already delivered. Bookings crossed 70,000 within the first 24 hours and have since exceeded one lakh.

Segment rivals and pricing

Priced from ₹11.49 lakh to (ex-showroom), the Sierra competes in the mid-size SUV segment. Its rivals include the Hyundai Creta, Kia Seltos, Maruti Suzuki Grand Vitara, Toyota Urban Cruiser Hyryder, Honda Elevate, and now the recently introduced Renault Duster.

Production ramp-up and EV plans

Tata Motors is increasing output at its Sanand facility, where the Sierra is produced alongside the Nexon. Monthly production is expected to reach around 15,000 units. An electric version of the Sierra is also in development, with a launch expected by June 2026.

Check out Upcoming Cars in India 2026, Best SUVs in India.