describe  CNG and LPG  gas.

LPG gas is predominantly propane (C3H8) with some butane (C4H10)  obtained mainly from oil refineries.
Compressed natural gas (CNG) is methane gas stored at high pressure. It is not liquefied, it has a lower energy density and is stored at very high pressures; about 200 bar.

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Compressed natural gas (CNG) (methane stored at high pressure) can be used in place of gasoline (petrol), Diesel fuel and propane/LPG. CNG combustion produces fewer undesirable gases than the fuels mentioned above.
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