Prime among its disadvantages is the loss of luggage space. CNG cylinders take up a lot of storage space and generally have to be placed in the boot of the car. The body of the cylinders too have to be made of good grade steel capable of handling the roughs and toughs of travelling. The cost of conversion too is another major determining factor. The conversion kit can cost from Rs. 25,000 to Rs. 35,000. But experts claim that this cost can be recovered from the fuel savings. Finally, based on its characteristics. CNG may slightly hamper vehicle performance.