Think ethanol is the fastest-growing alternative fuel? Not according to the president of Natural Gas Vehicles for America. Rich Kolodziej says compressed natural gas (CNG) is being used by more heavy-duty fleets such as refuse trucks and transit busses. The group says there were 130,000 CNG vehicles across the country in 2005, and one in five new transit busses are CNG powered. Estimates place the worldwide use at 5 million vehicles.
More technology is needed to convert passenger cars and light trucks. Honda does offer the Civic GX NGV. Because the fuel is a gas, there are no lubricating qualities and hardened valves must be installed. A higher compression ratio can be used with CNG's 130 octane rating.
