I will like to share my views in this matter as I used the LPG kit in my(maruti 1000 cc) car and found it that it is not worth, as the mileage/ average was apprx 150 km per cylender(here I feel the cylenders were less in weight) as nobody gets the properly filled cylenders and getting the milage of 150 out of a cylender is not economical at all. probably maruti 800 gives the milage of 200 to 225, that way it is economical and ecological but I always feel LPG cylender in the boot(or anywhere) of the car is always dangerous. in case of any jerk, accident, smoking, etc it may explode, or say with LPG cylender in your car .that means . you are sitting on a bomb, better play safe