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The calorific values of petrol and CNG are 45000 kj/kg and 50000 kj/kg if you have vehicle which can run on petrol and cng which fuel will you prefer and



I prefer CNG because its called as a cleaner fuel and cheap also, it guareentees about9-12yrs and it will not let out smoke and cng powered vehicles have low-maintenance cost and cng systems are sealed
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CNG would be preferred because its is clean and cheap and also it has lower calorific value
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