Other inhibitors to widespread CNG usage are increased refueling stops, refueling time with low pressure systems, and building a distribution network. The present gasoline refueling stations are supplied by the oil industry. Government regulations have kept the oil and gas businesses as separate entities. If current standards apply, then an entirely new distribution network would need to be developed. Government must also face the highway tax revenue issue.
Gasoline taxes support the highway system.
Presently, CNG is the cheapest, cleanest, and least environmentally impacting alternative fuel available. Several manufacturers have begun offering CNG powered engines. To change operation from gasoline to CNG or visa-versa, the operator flips a select switch to select for the fuel desired. See Figure 3. Typical Fuel Selection Switch Installation.