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Sometimes there's just one small disadvantage that doesn't let a technology take off.
CNG requires expensive tanks that hold far less fuel for a comparable gasoline tank. Not only that, the tanks require more maintenance over time.
Also, CNG tends to burn hotter under full load since there's no liquid fuel to evaporate during combustion, which can be hard on exhaust valves and such.
Fueling stations are a chicken and egg situation. A city might get away with converting their bus fleet to CNG since they only need a few stations, or maybe even just one like in my home town. But a trucking company needs several spread out over all their routes. And with the on board tanks giving each truck less range you'll need more of places to fuel than current truck stop locations. But without the trucks there's no incentive to build CNG stations, and without the stations, there's no incentive to buy CNG trucks.
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