Brezza CNG Real-World Mileage: City, Highway Mileage & Running Cost (2026)

The Maruti Suzuki Brezza CNG claims an ARAI-certified mileage of 25.51 km/kg, making it one of the most fuel-efficient compact SUVs currently on sale in India. But ARAI figures are measured in a laboratory, with no traffic, no AC and no real roads. What does the Brezza CNG actually deliver when you are stuck at a signal in Delhi heat with the AC on full blast?

That is what this post is about. We have compiled commonly reported mileage figures from owner communities, automotive forums and user experiences, then compared them against the official ARAI-certified figure and manufacturer specifications.

Quick Answer: Brezza CNG Mileage at a Glance

The Brezza S-CNG uses a 55-litre water-equivalent CNG cylinder. In real-world conditions, owners typically get around 7.3 to 8.3 kg of CNG during a refill, although the exact quantity varies depending on pump pressure, ambient temperature and dispenser calibration. 

Why There Is a Gap Between ARAI and Real-World Mileage

This applies to every car in India, not just the Brezza. ARAI certification happens on a dynamometer, which is basically a treadmill for cars. The test does not account for:

• Stop-and-go city traffic
• Air-conditioner usage, particularly during slow-moving city traffic where compressor load has a larger impact on overall efficiency 
• Fully loaded cabin (four adults and luggage)
• Varying road surfaces and flyovers
• Warm-up runs at idle
• CNG quality differences across pumps

So while 25.51 km/kg is the official number, it is smarter to treat 20 to 22 km/kg as your realistic planning figure for daily commutes.

Brezza CNG City Mileage: The Real Number

In typical Indian city conditions with AC running, the Brezza CNG returns between 19 and 21 km/kg for most owners. In very heavy stop-and-go traffic like peak hour Delhi or Gurugram, some owners report as low as 17 to 18 km/kg. In lighter city conditions with some free-flowing stretches, it can touch 22 km/kg.

A few things that specifically affect city mileage in CNG mode:

AC load matters. CNG engines are slightly less powerful than their petrol counterparts. The Brezza produces around 88 PS and 121.5 Nm in CNG mode compared to around 101 PS and 136 Nm in petrol mode. The difference is most noticeable during overtakes, steep climbs and when the vehicle is fully loaded. In heavy summer traffic, AC usage can reduce efficiency further because the engine has to work harder to maintain speed.

Flyovers and inclines. The reduced torque in CNG mode (121.5 Nm versus 136 Nm on petrol ) means the engine downshifts more on inclines. Frequent gear changes while climbing flyovers add up over a city commute.

Idling at signals. Long red lights in Indian cities mean a lot of idling. CNG consumption at idle is low, but it still adds up over 30 to 40 signals a day.

Based on commonly reported experiences across owner communities and automotive forums, many urban users in Delhi NCR report seeing around 19 to 21 km/kg in daily driving.

Brezza CNG Highway Mileage: Where It Truly Shines

On the highway, the Brezza CNG is genuinely impressive. At steady speeds between 80 and 100 km/h, many owners report 23 to 26 km/kg. Some conservative drivers on empty stretches have reported touching 28 to 29 km/kg.

Why does CNG do better on highways than in the city?

CNG burns most efficiently at steady, moderate speeds. Unlike petrol engines that enjoy high RPM performance, CNG variants prefer a calm, consistent throttle. On a Delhi to Jaipur or Delhi to Chandigarh run at 90 km/h, the Brezza CNG is in its element.

The one thing to plan for on highway runs is range. The Brezza S-CNG uses a 55-litre water-equivalent cylinder that typically holds around 7.3 to 8.3 kg of CNG during a refill. At highway efficiencies of 23 to 26 km/kg, this translates to roughly 170–210 km of highway driving range. 

What Factors Actually Affect Your Brezza CNG Mileage

Here are the main things that will push your real-world number up or down:

1. Driving style: Smooth, gradual acceleration and early gear shifts make the biggest difference. Aggressive throttle inputs in CNG mode kill efficiency fast because the engine has less torque to work with. Keeping RPMs under 2,500 in city driving helps noticeably.

2. AC usage: Running the AC continuously during peak summer conditions can have a noticeable impact on mileage, particularly in slow-moving city traffic where compressor load forms a larger percentage of total engine output.

3. Tyre pressure: Under-inflated tyres increase rolling resistance and bring your mileage down. Check tyre pressure every two weeks. The recommended pressure for Brezza is printed on the B-pillar sticker.

4. CNG pump quality and pressure: Not all CNG pumps dispense at the same pressure. A pump with low pressure fills your cylinder to less than full capacity, which means your effective range drops even though the meter shows a complete fill. Prefer high-traffic, well-maintained IGL or MGL pumps for consistent fills.

5. Service intervals: A clogged air filter or dirty spark plugs directly hurt CNG efficiency. Since CNG combustion places greater demand on ignition components, it is important to follow Maruti Suzuki’s recommended spark plug inspection and replacement schedule to maintain efficiency and smooth performance. 

6. Number of passengers and load: A fully loaded Brezza with four or five adults and luggage in the boot will return 1 to 2 km/kg less than a solo driver. The CNG cylinder already takes up a large portion of the boot, so avoid overloading the car.

7. Warm-up in petrol mode: Maruti’s factory-fitted CNG system starts the car in petrol mode and switches to CNG after the engine warms up slightly. This petrol consumption during the warm-up phase reduces your overall effective CNG range slightly in short-trip driving. On very short trips, the petrol consumed during the initial warm-up phase forms a larger proportion of total fuel usage than it does during longer journeys. 

Brezza CNG Running Cost vs Petrol: June 2026 Numbers

Here is where the Brezza CNG story gets really compelling. 

Note: Fuel prices used below are Delhi rates as of June 2026. Actual running costs will vary depending on your city and future fuel price changes.

• Petrol in Delhi: Rs. 102.12 per litre
• CNG in Delhi: Rs. 83.09 per kg

Over a year of typical urban use, a Brezza CNG owner saves roughly Rs. 35,000 to 40,000 compared to the petrol variant. Over five years, that is Rs. 1.75 lakh to Rs. 2 lakh in fuel savings alone, before accounting for fuel price increases.

The CNG variant costs approximately Rs. 91,000 more than the equivalent petrol variant at purchase. At current prices and typical usage, this premium pays back in roughly 2.5 to 3 years of ownership.

Pros and Cons of the Brezza CNG for Mileage-Focused Buyers

Where the Brezza CNG delivers:

The running cost advantage is genuine and significant. At Rs. 3.95 to 4.15 per km, it is one of the cheapest SUVs to run in India right now. For someone covering 1,200 to 1,500 km a month, the savings are very real. The factory-fitted kit also comes with Maruti’s warranty, which aftermarket CNG kits do not.

Where it falls short:

The boot space hit is significant. The factory-fitted CNG cylinder takes up a significant portion of the 328-litre boot. For a family that travels frequently with luggage, this is a real compromise. On long road trips where CNG pumps are not available, you will be running on petrol mode, which costs considerably more. Also, the reduced power in CNG mode is noticeable on steep ghats or fully loaded highway runs.

Who Should Buy the Brezza CNG

The Brezza CNG makes the most sense if:

• You travel more than 1,000 km a month in a city with good CNG infrastructure (Delhi NCR, Mumbai, Pune, Ahmedabad, Hyderabad, Surat)
• Most of your driving is within the city or on well-connected highways where CNG pumps are available
• You are a second-car owner who does not need a large boot for every trip
• Running cost is a higher priority than outright performance

The petrol variant makes more sense if: 

• Your driving involves frequent long highway trips to areas with limited CNG
• You regularly carry luggage or heavy loads 
• You strongly prefer the convenience of not planning refuel stops.

Final Word

The Brezza CNG does not deliver 25.51 km/kg in real life, but that is true of every car with an ARAI claim. What it does deliver is a consistent 20 to 22 km/kg in daily mixed driving, a running cost of under Rs. 4.15 per km at current Delhi prices, and the peace of mind of a factory-fitted kit supported by Maruti’s service network.

For daily commuters in cities with strong CNG infrastructure, it remains one of the most economical compact SUVs you can buy in India right now. The only thing you are giving up is boot space and the occasional flexibility on long trips to places where CNG is not easily available.

If you are covering more than 1,000 km a month in the city, the Brezza CNG is a very strong choice in 2026.

Frequently Asked Questions

What is the real-world mileage of Brezza CNG in city driving?

 Most owners in Indian cities report 19 to 21 km/kg in mixed city conditions with AC on. In very heavy stop-and-go traffic, it can drop to 17 to 18 km/kg.

Does the Brezza CNG actually give 25.51 km/kg? 

The 25.51 km/kg is the ARAI certified figure measured under controlled laboratory conditions. In real-world driving, this figure is not achievable consistently. Expect 20 to 22 km/kg in mixed driving as a realistic average.

What is the range of Brezza CNG on a full tank? 

The Brezza S-CNG uses a 55-litre water-equivalent CNG cylinder that typically accommodates around 7.3 to 8.3 kg of CNG depending on filling conditions. At a real-world average of around 20 to 22 km/kg, owners can generally expect approximately 150 to 210 km of driving range per fill.

Is Brezza CNG worth buying in 2026? 

At current Delhi CNG prices of Rs. 83.09 per kg versus petrol at Rs. 102.12 per litre, the running cost advantage is significant. The premium pays back in about 2.5 to 3 years for a typical daily commuter. For high-mileage urban users, it is a strong choice.

Does AC affect Brezza CNG mileage? 

Running the AC continuously in extreme summer conditions can have a noticeable impact on mileage, especially during slow-moving city commutes where engine load remains high.

Does the Brezza CNG run on petrol even when CNG is available?

The Brezza S-CNG starts in petrol mode and automatically switches to CNG once the engine reaches the required operating conditions. After the switch, it continues running on CNG until gas pressure drops below the required level or the CNG supply is exhausted. This automatic transition is completely seamless for the driver.

Which is better, factory CNG or aftermarket CNG for Brezza? 

Always go for the factory-fitted S-CNG kit. It comes with Maruti’s warranty coverage, is tuned specifically for the K15C engine, and does not void your insurance or manufacturer warranty. Aftermarket kits are cheaper but come with reliability and warranty risks.