Figure 7: Estimated Number of Natural Gas Vehicles in Use. This graph shows growth in the use of liquefied natural gas (LNG) and compressed natural gas (CNG) vehicles from 1992 to 2000. LNG vehicles in use grew from about 100 in 1992 to about 1,700 in 2000. CNG vehicles grew from about 23,000 in 1992 to about 100,000 in 2000.

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