Compare the best CNG cars in India in 2026 across hatchbacks and sedans. From the Maruti Celerio CNG at 35.60 km/kg to the Tata Tiago's 5-star safety and twin cylinder CNG boot space, this expert guide covers prices, features, mileage, and the best variant to buy for every budget from Rs. 6 lakh to Rs. 12 lakh.