Question

what does cng stand for and why is it considered to be better fuel then petrol

Answer 1

CNG stands for Compressed Natural Gas..It is better because it is actually the cleanest of all fossil fuels. CNG also produces 45% less hydrocarbons than gasoline...
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Answer 2

CNG : Compressed Natural Gas
This gas contain completely combustible gases which do not cause any significant pollution as they do not emit such harmful substances.
Hence considered as the ideal fuel.