CNG is Compressed
Natural Gas, which is mainly methane compressed at a pressure of 200 to 248 bars.
LPG is Liquefied Petroleum Gas, a mixture of
propane and butane liquefied at 15 --C and a pressure of 1.7 - 7.5 bar. ...
CNG is cheaper and cleaner, but
LPG has a higher calorific value.
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