The Indian SUV market has two very different propositions arriving at similar price points. The Tata Sierra EV brings a modern electric lifestyle with a 75 kWh battery and 624 km claimed range. The Mahindra Thar OG continues its legacy as a body-on-frame diesel off-roader with a 2.2 litre mHawk engine. Both wear SUV badges but serve distinct buyer mindsets. This comparison breaks down their specifications, pricing, features, and real-world positioning using data from CarDekho and Carlelo.
Price and variant positioning
The Mahindra Thar OG starts at Rs 10.32 lakh ex-showroom for the 1.5 litre AXT diesel rear-wheel-drive variant. The range tops out at Rs 18.99 lakh for the 2.2 litre ZXT 4WD diesel automatic. On-road price in New Delhi for the top-spec ZXT 4WD AT comes to approximately Rs 22.81 lakh.
The Tata Sierra EV enters at Rs 18.79 lakh ex-showroom for the Pure 63 RWD variant. The range-topping Empowered A 75 AWD ACFC variant is priced at Rs 26.48 lakh ex-showroom. Its on-road price in New Delhi reaches around Rs 28.03 lakh. There is a clear price gap of roughly Rs 8.5 lakh between the base models, though the top-end Thar OG and mid-spec Sierra EV variants overlap more closely.
Powertrain and performance
The Thar OG uses a 2.2 litre four-cylinder mHawk diesel engine producing 150 bhp at 3750 rpm and 330 Nm of torque between 1500 and 3000 rpm. It comes with a six-speed automatic transmission and a proper four-wheel-drive system with low-range gearing. The 1.5 litre diesel variant makes 117 bhp at 3500 rpm but is only offered with a manual gearbox.
The Sierra EV uses a 75 kWh lithium-ion battery pack powering an all-wheel-drive system through a single-speed automatic transmission. It supports DC fast charging at up to 120 kW, taking 26 minutes for a 20 to 80 percent top-up. AC charging via a 7.2 kW wall box takes 10.5 hours. The claimed range is 624 km on a full charge. Regenerative braking offers four levels of adjustment. The vehicle also supports vehicle-to-load and vehicle-to-vehicle charging.
Dimensions and packaging
The Thar OG measures 3995 mm in length, 1870 mm in width, and 1855 mm in height with a 2450 mm wheelbase. It offers 232 mm of ground clearance and approach, breakover, and departure angles of 40, 26.4, and 36 degrees respectively. It is a four-seater with a body-on-frame construction.
The Sierra EV is larger at 4340 mm long, 1841 mm wide, and 1750 mm tall with a longer 2730 mm wheelbase. Ground clearance stands at 205 mm. It seats five and offers 622 litres of boot space. The Sierra EV uses a monocoque platform which helps liberate interior space.
Suspension, steering, and brakes
The Thar OG uses double wishbone front suspension and a multi-link solid axle rear setup. The Sierra EV gets MacPherson strut front and multi-link rear suspension. Both have electric power steering, but the Sierra EV adds telescopic adjustment for the steering column. Turning radius for the Sierra EV is 5.32 metres. Both models get disc brakes on all four wheels. The Thar OG rides on 255/60 R19 all-terrain tyres while the Sierra EV uses 225/55 R19 radial tubeless tyres.
Interior, comfort, and convenience
The Sierra EV pulls ahead significantly in equipment. It gets a 12.3 inch touchscreen, a 10.25 inch digital instrument cluster, a 12-speaker JBL sound system with Dolby Atmos, dual-zone climate control, ventilated front seats, a panoramic sunroof, ambient lighting, powered and folding ORVMs, hands-free tailgate, wireless phone charging, paddle shifters, four drive modes, and a heads-up display. It also offers connected car features via the iRA.ev app suite including remote AC, door lock/unlock, OTA updates, and Alexa/Google integration.
The Thar OG offers a 10.25 inch touchscreen with wireless Android Auto and wired Apple CarPlay, a 10.25 inch digital cluster on higher variants, single-zone climate control, cruise control, front and rear parking sensors, and a manual sunroof on select variants. It misses out on wireless Apple CarPlay, a 360-degree camera, ventilated seats, and an auto-dimming IRVM.
Safety and ADAS
Both SUVs offer six airbags, ABS with EBD, electronic stability control, traction control, hill hold and descent control, ISOFIX mounts, and TPMS. The Sierra EV adds Level 2 ADAS features including forward collision warning, automatic emergency braking, lane keep assist, adaptive high beam assist, rear cross traffic alert, blind spot monitoring, and a 360-degree camera. It also gets an anti-theft alarm, SOS emergency assistance, and a heads-up display. The Thar OG relies on its structural rigidity and mechanical off-road aids like the electronic locking differential.
Exterior design and colours
The Thar OG retains its classic boxy silhouette with round headlamps, a seven-slot grille, side steppers, and a fender-mounted antenna. Colours include Everest White, Galaxy Grey, Stealth Black, Jeans Blue, Battleship Gray, Deep Forest, Tango Red, and Artemis Silver.
The Sierra EV adopts a cleaner, more modern design with signature Alpine-style rear quarter windows, connected LED light bars front and rear, a shark-fin antenna, roof rails, cornering fog lamps, and a panoramic sunroof. Colour options carry nature-inspired names like Nainital Nocturne, Coorg Clouds, Pristine White, Pure Grey, Bengal Rouge, Rishikesh Rapid, and Andaman Adventure.
Running cost and ownership
The Sierra EV shows a running cost of approximately Rs 1.20 per km based on electricity rates. The Thar OG's running cost depends on diesel prices and its claimed ARAI mileage of around 15 kmpl for the 2.2 litre variant. The Sierra EV comes with a 15-year or unlimited-kilometre battery warranty, which adds long-term peace of mind.
Pros and cons summary
The Thar OG wins on outright off-road capability, low-range gearing, approach and departure angles, and a proven mechanical package. Its drawbacks include cramped rear-seat access, limited features, no automatic on the 1.5 diesel, and a higher NVH level.
The Sierra EV offers a premium cabin, extensive feature list, strong safety tech, zero tailpipe emissions, low running costs, and a spacious five-seat layout with large boot. Its weaknesses include fit-and-finish inconsistencies, piano-black surfaces that scratch easily, no standard spare tyre, and a driving position that may not suit very tall occupants.
Verdict
Choosing between the Tata Sierra EV and Mahindra Thar OG depends entirely on the primary use case. The Thar OG remains the choice for enthusiasts who prioritize hardcore off-roading, a ladder-frame chassis, and the character of a turbo-diesel engine. It is also significantly more affordable at the entry level. The Sierra EV targets urban buyers seeking a feature-loaded, zero-emission family SUV with modern tech, spacious interiors, and low daily running costs. Its higher price reflects the battery technology and equipment on offer. Neither is a direct substitute for the other; they represent two different philosophies of what an SUV can be in India today.
FAQs
What is the starting price difference between Tata Sierra EV and Mahindra Thar OG?
The Tata Sierra EV starts at Rs 18.79 lakh ex-showroom while the Mahindra Thar OG starts at Rs 10.32 lakh ex-showroom, creating a difference of approximately Rs 8.47 lakh at the base variant level.
Which vehicle offers better range or mileage?
The Tata Sierra EV claims a range of 624 km on a full charge of its 75 kWh battery. The Mahindra Thar OG 2.2 litre diesel returns an ARAI mileage of around 15 kmpl with a 55 litre fuel tank.
Does the Tata Sierra EV have more features than the Mahindra Thar OG?
Yes, the Sierra EV offers a longer equipment list including a larger 12.3 inch touchscreen, 12-speaker JBL audio with Dolby Atmos, dual-zone climate control, ventilated seats, panoramic sunroof, Level 2 ADAS, 360-degree camera, heads-up display, and connected car features with OTA updates.
Which SUV has better off-road capability?
The Mahindra Thar OG has superior off-road hardware including a ladder-frame chassis, low-range transfer case, electronic locking differential, 232 mm ground clearance, and better approach and departure angles. The Sierra EV uses a monocoque platform with AWD but lacks low-range gearing.
What is the seating capacity and boot space of each model?
The Mahindra Thar OG is a four-seater with unspecified boot space. The Tata Sierra EV seats five and offers 622 litres of boot space.
