CNG vs Petrol: Kaun Sasta Padega? (Swift Example)

2026-10-11

CNG costs ₹79.09/kg in Delhi (Oct 2026) versus petrol at ₹102.12/litre. But is a CNG car actually cheaper overall? Let's do the math on the Maruti Swift.

The contenders

• Swift VXi petrol: ₹7.25 lakh ex-showroom (indicative), real city mileage ~14 kmpl
• Swift VXi CNG: ~₹8.20 lakh ex-showroom (indicative), real mileage ~24 km/kg

Running cost per km

• Petrol: 102.12 ÷ 14 = ₹7.29/km
• CNG: 79.09 ÷ 24 = ₹3.30/km

CNG saves about ₹4 per km. At 12,000 km/year, that's ₹48,000/year saved.

Breakeven

The CNG version costs ~₹95,000 more upfront. Breakeven comes in roughly 2 years. After that, it's pure savings — about ₹2.4 lakh over 5 years.

The catches

Boot space shrinks (the cylinder eats it), the CNG queue at pumps costs time, and resale of CNG cars is slightly softer in some cities. If your running is under 800 km/month, petrol's simplicity wins.

Fuel prices: Delhi, Oct 2026. Mileage: owner-reported approximations; verify with your dealer.