Maruti Fronx CNG

CNG mileage and running cost

The Maruti Fronx CNG carries an ARAI-certified mileage of 28.51 km/kg, which is among the best in the sub-₹10 lakh compact SUV segment. At a typical CNG pump price of around ₹90–95 per kg in major Indian cities, this translates to a per-kilometre running cost of roughly ₹3.2–3.4 — compared to approximately ₹4.5–5.0 per km for the petrol 1.2L variant at current fuel prices. Over 1,500 km a month, a CNG buyer can save upwards of ₹2,000–2,500 relative to the petrol version.

Autocar India's aggregated owner data puts real-world CNG mileage at around 27.21 km/kg, which is impressively close to the ARAI figure and suggests the Dual Jet engine's efficiency is well-preserved in CNG mode. The 1.2L Dual Jet engine uses dual fuel injectors per cylinder and Dual VVT (variable valve timing on both intake and exhaust), which helps maintain combustion efficiency even on the lower-energy-density CNG fuel.

For context, the petrol 1.2L MT variant returns 21.79 km/l (ARAI) and about 16.75 km/l in Autocar India's real-world test. The CNG variant's headline number is therefore not just marketing — it represents a genuine and substantial improvement in running economy for city-heavy drivers.

CNG kit, tank, and boot space

The Fronx CNG uses Maruti's proprietary factory-fitted S-CNG system, installed on the production line at the Maruti Suzuki plant — not retrofitted at the dealership. This is a critical distinction: the factory fitment preserves the full manufacturer warranty (3 years / 1,00,000 km as listed by Autocar India), and the system is engineered to the vehicle's structural and safety tolerances from the ground up.

The S-CNG system integrates a dedicated dual-display system that simultaneously shows petrol and CNG consumption figures on the instrument cluster. A fuel changeover switch on the dashboard lets the driver switch between CNG and petrol without stopping the car — useful when CNG runs low mid-journey. The system also features an Idle Start-Stop (ISS) function to reduce fuel waste at traffic signals.

The CNG cylinder is mounted in the boot, and while the petrol Fronx offers 308 litres of boot space, the CNG cylinder occupies a significant portion of the boot floor. Maruti's official data does not specify the remaining usable boot volume with the cylinder fitted, so buyers should inspect the boot in person at a Nexa showroom before purchase. The 60:40 split-folding rear seat remains available to extend cargo capacity when needed.

Performance on CNG

On CNG, the Fronx's 1.2L engine produces 77.5 PS (76 bhp) and 98.5 Nm of torque — a modest reduction from the petrol version's 88 hp and 113 Nm. This power dip is normal for CNG conversions and is most noticeable during overtaking manoeuvres at highway speeds or when climbing steep gradients with a full load. In city driving, the performance gap is far less perceptible.

The 5-speed manual gearbox is the only transmission offered with the CNG variant — there is no AMT or automatic option. The gear ratios are well-suited to urban stop-go traffic, and the Dual VVT system helps maintain reasonable low-end torque. Drivers accustomed to the petrol AMT variants will need to adjust expectations, but for a daily city commuter, the CNG MT is entirely adequate.

The Fronx CNG does not get the 1.0L Turbo Boosterjet engine — that unit is reserved for the higher petrol trims (Delta+, Zeta, Alpha). CNG buyers are therefore choosing economy over performance, which is the correct trade-off for the target audience.

Cabin, space, and tech

The Fronx CNG is offered in Sigma and Delta trims, which means the cabin is more modestly equipped than the Zeta and Alpha petrol variants. The Sigma MT CNG gets projector headlamps, electronic stability control, ABS with EBD, traction control, and a part-digital instrument cluster. The Delta MT CNG adds a rear parking camera, electrically foldable ORVMs with turn indicators, phone-based satellite navigation, OTA updates, and a video player.

Neither CNG variant gets the 9-inch SmartPlay Pro+ touchscreen, head-up display, wireless charging, 360-degree camera, or cruise control — those features are exclusive to the Zeta and Alpha petrol trims. The cabin seats five adults comfortably, with the Fronx's Baleno-derived platform providing a reasonably spacious rear bench for a sub-4-metre footprint. Dimensions stand at 3,995 mm long, 1,765 mm wide, and 1,550 mm tall on a 2,520 mm wheelbase.

Suzuki Connect with 40+ connected car features (including remote operations, vehicle tracking, Alexa compatibility, and a free 3-year subscription) is available on the Fronx range, though buyers should confirm availability on the specific CNG trim at their Nexa outlet.

Safety and ADAS

The Fronx is built on Maruti's HEARTECT platform, engineered to absorb and distribute crash energy away from the passenger cell. The safety suite includes 6 airbags (front, side, and curtain) across variants, along with ABS, EBD, and ESP (Electronic Stability Programme) to counteract skidding. Hill-Hold Assist is also part of the package, which is useful given the CNG variant's slightly reduced power output on inclines.

The Fronx has not been rated by Bharat NCAP or Global NCAP as of the time of writing. Buyers seeking a crash-tested rating in this segment should note that the Tata Nexon CNG carries a 5-star Global NCAP rating. That said, the Fronx's 6-airbag standard fitment and HEARTECT platform represent a solid passive safety foundation for its price point.

The CNG variants (Sigma and Delta) do not offer ADAS features such as autonomous emergency braking or lane-keep assist — those are not available on any Fronx variant at present.

CNG variants and pricing

The Fronx CNG is available in exactly two variants, both with a 5-speed manual gearbox:

• Sigma MT CNG — ₹7.79 lakh (ex-showroom, as per Hindustan Times price list, September 2026)
• Delta MT CNG — ₹8.59 lakh (ex-showroom, as per Hindustan Times price list, September 2026)

The Sigma is the entry point, offering essential safety and comfort features. The Delta adds meaningful convenience upgrades including a rear camera, navigation, and OTA updates, making it the better-value pick for most buyers. The CNG premium over the equivalent petrol Sigma MT (₹6.85 lakh) is approximately ₹94,000 — a gap that can be recovered in fuel savings within 2–3 years for a typical 1,200–1,500 km/month driver.

How it compares

The Fronx CNG's closest rivals are the Tata Nexon CNG (28.04 km/kg ARAI, factory-fitted, starts ~₹9.99 lakh) and the Hyundai Exter CNG (27.1 km/kg ARAI, factory-fitted). The Fronx CNG undercuts both on price while matching or exceeding them on claimed mileage. The Maruti Baleno CNG (a sibling model) offers a similar powertrain in a hatchback body at a lower price, but lacks the Fronx's SUV stance and ground clearance.

The Toyota Taisor CNG is essentially a rebadged Fronx CNG sold through Toyota's Urban Cruiser network, with near-identical specs and pricing. Buyers choosing between the two should compare local dealer service quality and offers. Against the Renault Kiger CNG and Nissan Magnite CNG, the Fronx CNG holds an advantage in mileage and brand service network depth, though those rivals offer turbo-petrol engines in higher trims that the Fronx CNG cannot match.

Who should buy it

The Maruti Fronx CNG is the right choice for a buyer who wants a compact SUV with premium Nexa branding, a factory-guaranteed CNG system, and the lowest possible per-kilometre running cost in the segment. It is best suited to urban and semi-urban drivers who cover 1,200 km or more per month in cities with good CNG infrastructure — Delhi-NCR, Mumbai, Pune, Ahmedabad, and Surat being prime examples.

Buyers who need an automatic gearbox, a large boot, or advanced driver assistance features should look at the petrol Fronx variants or consider the Tata Nexon CNG. But for the cost-conscious commuter who values Maruti's service network (the largest in India), the factory S-CNG warranty, and a 28.51 km/kg headline number, the Fronx CNG Delta MT at ₹8.59 lakh is a hard proposition to beat in its class.