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Compressed Natural Gas or CNG is becoming and increasingly attractive fuel for many transportation uses One reason for the increase in interest in CNG is that the emissions of a CNG vehicle are far less than that of a gas powered engine Other factors that make the production of CNG vehicles is that the gas prices have risen in the past couple yearsNatural gas is well natural gas--the same stuff that heats your stove or your house It is largely produced domestically in the United States it can be imported through pipelines or as a super-cold liquid on special tanker ships but because this is a lot harder than pouring crude or refined oil into a tanker or a pipeline we havent built up an import dependency for natural gas as we have for petroleum Natural gas is distributed nationwide through an extensive network of pipelines which feed electrical generation plants and domestic and industrial heating uses In order to store a reasonable amount of fuel natural gas has to be compressed to around 200 times atmospheric pressure--or even more for the tanks aboard large buses This is like the pressure a mile and a quarter under the ocean It is very easy on the engine giving longer service life and lower maintenance costs CNG is the least expensive alternative fuel when you compare equal amounts of fuel energy such as gasoline Because there is a huge and predictable demand for natural gas from domestic industrial and utility users there is a large buffering effect against price fluctuations At the peak of the big gasolineprice run-up in April 1996 everyone was paying half as much for a gasoline-gallon-equivalent of 130-octane natural gas as I would have aid for a gallon of 92-octane unleaded gasoline You get significantly better fuel economy on the open road because the high octane rating of the fuel allows timing and mixture to be adjusted for more efficiency without causing detonation
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