The 2025 Maruti Suzuki Ertiga VXi (O) CNG delivers a certified mileage of 26.11 km/kg. In real-world conditions, expect roughly 18 km/kg in the city and up to 35 km/kg on highways. Typical depreciation sees the car retain about 75-80% of its value after the first year, leaving a residual value of roughly ₹9 Lakhs after three years.