Natural gas cost less than alternative fuel sources. For example, while the price of gasoline has risen rapidly over the last year, the price of natural gas has fallen to the lowest level in a decade. The reason why natural gas prices are low has to do with increase production of hydraulic fracturing. Efforts are being made to use more natural gas.
Vehicles: For example, most fleet vehicles (buses) already use natural gas. The market is limited to vehicles that can make it back to headquarter for refilling. Crystler announced a pickup truck that will run on both gasoline and natural gas.