Maruti Ertiga Mileage Comparison: Petrol vs CNG (2026)

The Maruti Ertiga is a highly popular seven-seater MPV known for its practicality and comfort. You can choose between refined petrol and factory-fitted CNG fuel options. The petrol engine gets a five-speed manual or a six-speed torque converter automatic transmission. The CNG version comes exclusively with a five-speed manual gearbox. This Maruti Ertiga mileage comparison matters for your long-term daily running costs. Buyers wanting driving convenience often prefer the petrol automatic variant. Budget-conscious drivers focus on the excellent fuel efficiency of the CNG model.

Variant-Wise Price Difference

Before we proceed with the Ertiga mileage comparison, it is important to understand the price premium. The CNG option is available on the VXi and ZXi variants. Let us look at the ex-showroom price difference for the Ertiga VXi and ZXi trim.

There is a typical premium for the CNG factory fitment. You pay an extra Rs. 91,000 for the VXi and ZXi Ertiga CNG variant.

Maruti Ertiga ARAI Mileage Figures

Here are the lab-tested figures for the Maruti Suzuki Ertiga mileage.

Disclaimer: Maruti Ertiga ARAI mileage is not equivalent to real-world average. While ARAI figures are tested under laboratory conditions, actual road driving provides varying statistics.

Maruti Ertiga Mileage vs Competitors

The Maruti Suzuki Ertiga CNG delivers a brilliant average for large families looking to keep running costs to an absolute minimum. However

The Kia Carens petrol delivers a lower 15.7 km/l petrol average compared to the Maruti Ertiga. The Toyota Rumion achieves a nearly identical Maruti Ertiga average since they share the same powertrain. The Ertiga offers a factory-fitted CNG option with an impressive 26.11 km/kg claimed efficiency.

if you prefer a slightly more premium, captain-seat experience without sacrificing much efficiency, the Maruti XL6 mileage comparison reveals up to 20.97 km/l on petrol and a very frugal 26.32 km/kg on CNG.

Maruti Ertiga Real-World Fuel-Efficiency (City vs Highway)

Below is the real-world average of the Maruti Ertiga in both city and highway conditions.

In city driving conditions, the Ertiga petrol manual typically delivers around 14 to 16 km/l. The CNG manual returns a significantly higher 22 to 24 km/kg in urban traffic. On the highway, the gap continues to remain substantial. The petrol manual offers approximately 16 to 18 km/l during highway cruising. The CNG variant stretches further with an impressive 24 to 26 km/kg. 

Real-world numbers differ from ARAI figures because lab tests exclude traffic and air conditioning. City traffic impacts petrol efficiency due to constant idling and frequent gear shifts. Smooth driving styles significantly improve the highway Maruti Ertiga fuel efficiency.

Please bear in mind that maintaining the right Maruti Suzuki Ertiga tyre pressure is important to obtain the right mileage on every trip.

Ertiga Petrol vs CNG: Performance Comparison

Beyond Ertiga fuel efficiency, here is how the performance specs compare between the models.

The real-world drivability difference is noticeable during highway overtakes with a full passenger load. Petrol engines are less load sensitive when all seven seats are fully occupied. You will feel a power drop in CNG mode. This power drop requires more frequent gear changes on steep inclines and mountain roads.

Petrol vs CNG: Cost Comparison

Ertiga running cost

To understand the true running cost difference, we must use the Maruti Ertiga real-world average mileage.

For calculation purposes:

• Petrol price assumed at Rs. 100/litre

• CNG price assumed at Rs. 80/kg

   

When you factor in realistic driving conditions, the difference becomes substantial. The CNG variant of the Ertiga costs nearly half per kilometre compared to petrol. Your running cost with the Maruti Ertiga petrol is roughly Rs. 6.25 per kilometre. 

The Ertiga CNG running cost drops to just around Rs. 3.33 per kilometre. Even after accounting for slightly higher annual maintenance, the CNG version remains significantly more economical.

Monthly & 5-Year Fuel Cost Projection

Let us assume a realistic scenario of driving 1,500 km monthly. This will help us find your total fuel expenses.

The savings with CNG are massive over a five-year period. You save roughly Rs. 4,375 every single month on fuel. You will recover the upfront Rs. 91,000 premium relatively quickly. It takes just about 21 months to cover this difference. After that, you enjoy pure savings on your daily family commutes.

Practical Ownership Tradeoffs

Whether you are buying a new or a used Maruti Ertiga, here are the things you need to consider before deciding between the powertrain options:

• Boot Space Impact

   

The CNG tank significantly reduces the 209-litre boot capacity. You can only accommodate soft bags with limited luggage flexibility when all seats are up.

• Variant Limitation

   

CNG is available in VXi and ZXi trims but misses out on the top ZXi Plus. You miss premium features like smart hybrid technology and a rearview camera.

• Refuelling Convenience

   

CNG infrastructure in India is still expanding across rural highways. Long queues at CNG stations are common in metro cities which wastes time.

• Maintenance & Reliability

CNG cars may require more frequent spark plug replacements during routine servicing. However, Maruti factory-fitted CNG kits are highly reliable and extremely safe.

• Resale Value

   

Both petrol and CNG variants enjoy strong resale demand in the used car market.

Ertiga Petrol vs CNG: Who Should Buy Which

Here is a quick summary for your buying decision.

Choose Petrol if:

• You need the absolute convenience of a six-speed automatic gearbox.
• You frequently travel with full luggage and seven passengers on long trips.

• You prefer strong engine performance for effortless highway overtakes.

   

Choose CNG if:

• Your daily commute exceeds 50 kilometres in heavy stop-and-go traffic.
• You want the absolute lowest daily running costs possible for your family.
• Boot space is not your primary buying concern for daily city driving.