Choosing the right car fuel in India is no longer simple. With rising fuel prices, stricter emission norms and changing driving needs, buyers are often confused between PETROL, DIESEL and CNG cars. Each fuel type has its own advantages and drawbacks in terms of running cost, mileage, performance and maintenance. In this Thinkolio guide, we break down the pros, cons and best use cases of petrol, diesel and CNG cars to help Indian buyers make the right decision.
Petrol vs Diesel vs CNG: Key Factors Compared
*Fuel prices, mileage and vehicle price differences are approximate and may vary based on city, car model and driving conditions.
Best Fuel Choice by Usage: Petrol vs Diesel vs CNG
💡 Thinkolio InsightCars Available in Petrol, Diesel & CNG (Under ₹10 Lakh)
🚗 Tata Altroz Petrol vs
Diesel vs
CNG
Price, Mileage & Safety Compared
*Prices are ex-showroom approximate for India; actual may vary by city and variant. Mileage is ARAI-claimed or tested figures. Sources include Hyundai India specs and Autocar India.
🚙 Tata Nexon Petrol vs
Diesel vs
CNG
Price, Mileage & Safety Compared
| Specification | Tata Nexon Petrol | Tata Nexon Diesel | Tata Nexon CNG |
|---|---|---|---|
| Engine | 1.2L Turbocharged Revotron (1199 cc) | 1.5L Turbocharged Revotorq (1497 cc) | 1.2L Turbo Petrol + CNG (1199 cc) |
| Transmission | 5-Speed MT / 6-Speed MT / DCT | 6-Speed MT / AMT | 5-Speed Manual |
| Max Power | 120 PS | 115 PS | 100 PS (Petrol mode) |
| Max Torque | 170 Nm | 260 Nm | 170 Nm |
| Mileage (ARAI) | 17.01 – 17.44 km/l | 23.23 – 24.08 km/l | 17.44 km/kg |
| Fuel Tank Capacity | 44 litres | 44 litres | Petrol + CNG (Dual Cylinder) |
| Boot Space | 382 litres | 382 litres | Approx. 321 litres |
| Seating Capacity | 5 Seater | ||
| Dimensions (L × W × H) | 3995 × 1804 × 1620 mm | ||
| Wheelbase | 2498 mm | ||
| Ground Clearance | 208 mm | ||
| Safety Rating | 5-Star Global NCAP | ||
| Safety Features | 6 Airbags, ABS with EBD, ESC, Hill Hold Control, TPMS, ISOFIX Child Seat Mounts | ||
| Key Features | Touchscreen Infotainment, Android Auto & Apple CarPlay, Cruise Control, Push Button Start | ||
| Ex-Showroom Price (₹) | ₹7.99 – ₹13.69 lakh | ₹9.99 – ₹15.49 lakh | ₹8.99 – ₹14.49 lakh |
| Best For | City driving & balanced performance | Highway driving & long-distance users | Lowest running cost seekers |
🚗 Hyundai Aura Petrol vs
Diesel vs
CNG
Price, Mileage & Safety Compared
| Specification | Hyundai Aura Petrol | Hyundai Aura Diesel | Hyundai Aura CNG |
|---|---|---|---|
| Ex-Showroom Price (₹) | ₹6.5 – ₹9.5 lakh | ₹8 – ₹11 lakh | ₹7.5 – ₹9.3 lakh |
| Engine | 1.2L Kappa Petrol (1197 cc) | 1.2L U2 CRDi Diesel (1197 cc) | 1.2L Kappa Petrol + CNG (1197 cc) |
| Transmission | 5-Speed Manual / AMT | 5-Speed Manual / AMT | 5-Speed Manual |
| Max Power | 83 PS @ 6000 rpm | 75 PS @ 4000 rpm | 73 PS @ 6000 rpm |
| Max Torque | 114 Nm @ 4000 rpm | 190 Nm @ 1500-2750 rpm | 100 Nm @ 4000 rpm |
| Mileage (ARAI) | 20 km/l | 25 km/l | 28 km/kg |
| Fuel Tank Capacity | 37 litres | 37 litres | Petrol + CNG (Twin Cylinder) |
| Boot Space | 407 litres | 407 litres | Approx. 330 litres |
| Seating Capacity | 5 Seater | ||
| Dimensions (L × W × H) | 3995 × 1680 × 1520 mm | ||
| Wheelbase | 2450 mm | ||
| Ground Clearance | 165 mm | ||
| Safety Rating | 4-Star Global NCAP | ||
| Safety Features | Dual Airbags, ABS with EBD, ESC, Hill Hold Control, Rear Parking Sensors, ISOFIX Child Seat Mounts | ||
| Key Features | Touchscreen Infotainment, Android Auto & Apple CarPlay, Rear Camera, Push Button Start, Steering Mounted Controls | ||
| Best For | City driving & fuel efficiency | Highway & long-distance travel | Lowest running cost seekers |
👉 Choose Petrol for balanced usage and lower upfront cost, Diesel if you frequently drive on highways and cover long distances, and CNG for daily city commuting with the lowest running cost and cleaner emissions.
Frequently Asked Questions (FAQ)
1. Which is the most fuel-efficient car?
CNG variants are most efficient: Hyundai Aura ~28 km/kg, Tata Altroz ~17.5 km/kg, Tata Nexon ~17.4 km/kg.
2. Best car for city driving?
Petrol Tata Altroz and Hyundai Aura offer smooth city driving and good fuel efficiency.
3. Safest car for highway driving?
Tata Nexon (5-Star Global NCAP) is best, followed by Tata Altroz (5-Star). Hyundai Aura has 4-Star rating.
4. Price comparison?
Tata Nexon: Petrol ₹7.99–13.69 L, Diesel ₹9.99–15.49 L, CNG ₹8.99–14.49 L
Hyundai Aura: Petrol ₹6.5–9.5 L, Diesel ₹8–11 L, CNG ₹7.5–9.3 L
Tata Altroz: Petrol ₹6.29–10.39 L, Diesel ₹7.29–11.29 L, CNG ₹7.5–9.9 L
5. Which fuel type is best for low running cost?
CNG for city, Diesel for highways, Petrol for balanced use.
Best Mileage Cars Under ₹10 Lakh (2026) – Petrol & CNG
🔗 For more details, visit the official websites: