Toyota has prepared a very eco-friendly vehicle for L.A auto show, This Camry actually runs on natural Gas, along with a hybrid system.  So too much economy here! CNG is one of the acceptable options to replace gasoline and diesel in engines, since it is much much cleaner, and there are alot if it available and it’s much easier to produce as well. But its serious drawback is performance, and it is so bad in this sense that no big company actually consider CNG as a viable option.  Of course Toyota’s Concept with hybrid CNG system has a long way to actually become a mass produced solution, but take into account that Toyota never does stupid things, so we might hear more about this car in future.