At present, filling of LPG on the go is a problem. However if LPG stations started opening (depends on so many factors), CNG business might go down. And if Biodiesel becomes available..................then both CNG & LPG people are damned!
By the way old self converted diesels are messy but brand new diesel cars are quite good, no drilling of holes in Engine/Body, no fiddling with electronics, no damage to shocks, no loss of trunk space, no loss of power and NO WARRANTY void. 1 Rupee per km difference between CNG & Diesel is balanced by initial cost (85000) of kit. if u add those 85000/- to diesel, u can drive hassle free for many many kms.
This only applicable to those who buy Corolla, not valid for Suzuki or other brands.