Answers

2016-01-15T20:38:36+05:30
Because it is a very costly fuel for commercial us . So it is called gold .and since it is in liquid firm it is called liquid gold..
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2016-01-15T20:49:52+05:30
Its price rises like gold day after day;-)
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You can see that petrol price rises day by day  and become   costly and it is liquid also that's why it is called liquid gold