1998 Toyota Corolla 1.3 GL
petrol mileage: 12 km/l local and 15 km/l on motorway
no CNG
2006 Mitsubishi Lancer 1.3 GLX
petrol mileage: 13 km/l local and 16 km/l on motorway
no CNG
2008 Suzuki Cultus 1.0 VXRi CNG
petrol mileage: 13 km/l local and 15 km/l on motorway
CNG mileage: around 20-25 km/kg