Hyundai Exter Petrol vs CNG: Which One Should You Buy?
Published on 2 September 2026
If you are trying to choose between the Hyundai Exter petrol and the Hyundai Exter CNG, the petrol version is the better all-round choice if you want stronger performance, more boot space or the convenience of an AMT. The Exter CNG makes more sense if you drive regularly, have easy access to a CNG station and are comfortable with a manual gearbox.
Although CNG costs less per kilometre, the Exter CNG is around ₹1.07 lakh to ₹1.51 lakh more expensive than a comparable petrol variant in Gurugram. You should therefore consider how much you drive before paying the additional amount.
Hyundai Exter Petrol vs CNG: Quick Comparison
| Specification | Exter petrol | Exter CNG |
| Engine | 1.2-litre Kappa petrol | 1.2-litre bi-fuel Kappa petrol-CNG |
| Displacement | 1,197 cc | 1,197 cc |
| Cylinders | Four | Four |
| Maximum power | 83 PS | 69 PS in CNG mode |
| Maximum torque | 113.8 Nm | 95.2 Nm in CNG mode |
| Transmission | 5-speed manual or AMT | 5-speed manual |
| Reported ARAI mileage | 19.4 km/l for MT; 19.2 km/l for AMT | 27.1 km/kg |
| Boot space | 391 litres | 225 litres |
| Petrol-tank capacity | 37 litres | 37 litres |
| CNG capacity | Not applicable | 60 litres, water equivalent |
| Best suited to | General use, automatic buyers and highway driving | Regular city use and higher monthly running |
Mileage figures are based on ARAI testing and may not match what you get in everyday driving.
Engine and Performance
Both versions of the Exter use Hyundai’s 1.2-litre, four-cylinder Kappa engine, but their outputs are different.
The petrol engine produces 83 PS and 113.8 Nm. In the CNG version, output falls to 69 PS and 95.2 Nm when the car is running on CNG. The difference should be noticeable when the car is carrying passengers and luggage, climbing a slope or overtaking at highway speeds.
For regular city driving, the CNG version should provide adequate performance. However, the petrol Exter is the better option if you frequently travel on highways or prefer quicker responses from the engine.
The CNG model is bi-fuel, which means it can run on petrol as well as CNG. Petrol serves as a useful backup when a CNG station is unavailable. However, the main reason to buy this version is to use it primarily on CNG and benefit from the lower running cost.
Manual or AMT: An Important Difference
The petrol Exter is available with both a five-speed manual and a Smart Auto AMT. The CNG model is offered only with a five-speed manual gearbox.
This can make the decision simple for some buyers. If you want an automatic for driving through congested areas such as Golf Course Road, Sohna Road or the Delhi-Gurugram Expressway, you will need the petrol Exter.
The petrol AMT will be easier to drive in stop-and-go traffic because there is no clutch pedal to operate. Select AMT variants also get paddle shifters. The CNG version is worth considering only if you are comfortable driving a manual.
Hyundai Exter Petrol and CNG Mileage
Multiple automotive sources report the following ARAI-tested mileage figures for Hyundai Exter:
- Petrol manual: 19.4 km/l
- Petrol AMT: 19.2 km/l
- CNG manual: 27.1 km/kg
These numbers come from controlled tests. Actual mileage can change depending on traffic, driving style, air-conditioning use, tyre pressure, road conditions and the number of people in the car.
Fuel Cost in Gurugram
As of 2 September 2026, petrol in Gurugram costs approximately ₹102.97 per litre, while CNG costs ₹92.01 per kg. Based on these prices and the reported ARAI mileage, the approximate fuel cost works out as follows:
| Powertrain | Reported mileage | Approximate fuel cost per km |
| Petrol manual | 19.4 km/l | ₹5.31 |
| Petrol AMT | 19.2 km/l | ₹5.36 |
| CNG manual | 27.1 km/kg | ₹3.40 |
The CNG model theoretically saves approximately ₹1.91 per kilometre compared with the petrol manual. Real-world savings may be different because neither version is likely to return its certified mileage in every driving condition.
Here is what the potential saving looks like at different levels of monthly running:
| Monthly running | Approximate monthly saving with CNG | Approximate annual saving |
| 800 km | ₹1,530 | ₹18,340 |
| 1,000 km | ₹1,910 | ₹22,930 |
| 1,200 km | ₹2,300 | ₹27,500 |
| 1,500 km | ₹2,870 | ₹34,390 |
The calculation only covers fuel. It does not account for changes in fuel prices, maintenance expenses, loan interest or resale value.
Gurugram On-Road Price Comparison
The following estimated Gurugram on-road prices were listed by CarDekho in September 2026:
| Variant | Petrol on-road price | CNG on-road price | Approximate CNG premium |
| HX 2 | ₹6.43 lakh | ₹7.94 lakh | ₹1.51 lakh |
| HX 3 | ₹7.15 lakh | ₹8.44 lakh | ₹1.28 lakh |
| HX 4 | ₹8.25 lakh | ₹9.36 lakh | ₹1.12 lakh |
| HX 6 | ₹9.04 lakh | ₹10.11 lakh | ₹1.07 lakh |
| HX 6 Knight | ₹9.20 lakh | ₹10.28 lakh | ₹1.07 lakh |
| HX 8 | ₹9.50 lakh | ₹10.63 lakh | ₹1.14 lakh |
These prices include estimated registration and insurance charges. Your final quotation may differ because of insurance selection, dealer discounts, accessories and additional charges.
How Long Will It Take to Recover the CNG Premium?
Using the estimated fuel saving of ₹1.91 per kilometre, recovering the additional price of the CNG version could take approximately:
- HX 2: Around 79,000 km
- HX 3: Around 67,000 km
- HX 4: Around 58,000 km
- HX 6: Around 56,000 km
- HX 6 Knight: Around 56,000 km
- HX 8: Around 60,000 km
A buyer driving 1,500 km per month could cover 54,000 km in three years. For this buyer, the CNG premium may be recovered in roughly three to four-and-a-half years, depending on the variant and actual fuel economy.
Someone driving only 600 or 700 km per month may take considerably longer. In that situation, the petrol model’s lower purchase price may be more valuable than the CNG model’s lower fuel bill.
Boot Space and Practicality
Boot space is another major difference. The Exter petrol offers 391 litres, while the Exter CNG provides 225 litres. That is a reduction of 166 litres.
Hyundai uses two smaller CNG cylinders instead of one large cylinder across the boot. The spare wheel is mounted underneath the vehicle, helping retain a usable luggage area. This arrangement is more practical than older CNG layouts that occupied most of the boot.
Even so, 225 litres can become restrictive when travelling with a family. It should manage everyday bags and smaller pieces of luggage, but the petrol model is better suited to airport trips and longer holidays.
If your Exter will mainly be used for commuting, the smaller CNG boot may not be a serious concern. If family travel is a priority, the petrol version has a clear advantage.
Features and Variant Availability
The petrol Exter is available across the complete range and offers the widest choice of manual and AMT variants. The CNG option is available with HX 2, HX 3, HX 4, HX 6, HX 6 Knight and HX 8 trims, but only with a manual gearbox.
Both versions receive important standard safety features such as:
- Six airbags
- ABS with EBD
- Electronic Stability Control
- Vehicle Stability Management
- Hill-start Assist Control
- Rear parking sensors
- ISOFIX child-seat anchors
- Three-point seatbelts for all seats
Higher trims add equipment such as a touchscreen infotainment system, rear camera, Highline TPMS, dashcam, sunroof, automatic climate control and alloy wheels. Buyers should compare equivalent trims instead of choosing only on the basis of fuel type.
What About CNG Availability?
CNG availability is reasonably good across Gurugram and Delhi-NCR, but convenience depends on where you live and travel. Check whether there is a reliable station near your home, workplace or regular route.
Queues can also reduce some of the convenience gained from lower fuel costs. A saving of around ₹2 per kilometre may feel less worthwhile if every refill requires a substantial detour or a long wait.
Before buying, visit nearby CNG stations at the times you usually travel. This gives you a more realistic idea of whether CNG ownership will fit into your routine.
Maintenance and Ownership
The Exter CNG uses a company-fitted system designed to work with the engine and its electronic controls. It is a safer and more integrated option than converting a petrol car with an aftermarket kit.
However, CNG ownership still requires proper servicing. Follow Hyundai’s maintenance schedule and comply with the prescribed inspection requirements for the cylinder and related components. Maintenance costs can vary, so it is worth asking a Hyundai service centre for a petrol-versus-CNG service estimate before booking.
The brochure mentions an optional extended warranty of up to seven years or 1,40,000 km, whichever comes first. Terms and eligible packages should be confirmed with the dealership.
Who Should Buy the Hyundai Exter Petrol?
Choose the Exter petrol if you:
- Drive less than approximately 1,000 km per month
- Want an AMT for congested city traffic
- Frequently travel with luggage
- Want stronger acceleration and highway performance
- Do not have convenient access to a CNG station
- Prefer a lower initial purchase price
- Want the widest choice of variants
The petrol version is the safer all-round recommendation for most private buyers. It costs less to purchase and does not require you to compromise on boot space or gearbox choice.
Who Should Buy the Hyundai Exter CNG?
Choose the Exter CNG if you:
- Regularly drive around 1,200 to 1,500 km or more per month
- Expect to keep the car long enough to recover the CNG premium
- Have a convenient CNG station nearby
- Mostly drive within the city
- Are comfortable with a manual gearbox
- Can manage with 225 litres of boot space
- Place running costs ahead of stronger performance
The CNG version is particularly suitable for buyers with predictable daily travel, such as a long office commute.
Final Verdict
The Hyundai Exter petrol is the more versatile option. It offers stronger performance, 391 litres of boot space and a choice between manual and AMT gearboxes. Its lower purchase price also makes it more sensible for buyers with moderate annual running.
The Exter CNG can reduce fuel expenses, but it is not automatically the cheaper choice. Its Gurugram on-road premium ranges from approximately ₹1.07 lakh to ₹1.51 lakh, and recovering that amount may require around 56,000 to 79,000 km under ideal mileage calculations.
If you drive at least 1,200 to 1,500 km every month, have easy access to CNG and plan to keep the car for several years, the Exter CNG can be a sensible investment. For lower running, frequent highway use, more luggage space or automatic convenience, choose the Exter petrol.
Frequently Asked Questions
Can the Hyundai Exter CNG run on petrol?
Yes. The Exter CNG uses a bi-fuel engine and has a 37-litre petrol tank in addition to its CNG cylinders.
Is the Hyundai Exter CNG available with an automatic gearbox?
No. The Exter CNG is available only with a five-speed manual transmission. The AMT option is limited to the petrol version.
How much boot space does the Hyundai Exter CNG offer?
The Exter CNG offers 225 litres of boot space, compared with 391 litres in the petrol model.
