i have driven my friend's japanese alto 4 door,, it was a nice and comfortable xperince.. my friend had also fit c.n.g in it.. but the c.n.g is not workn properly i.e. whn the car is switched to c.n.g . it shows 'check engine' lite. .. and the pick up becomes.. very very dumb.. so c.n.g in this car is not gud at all .. overall the car is gud , luxurious and comfortable !