The above answer would imply that 1167.9189 litres of air would have a mass of 1 metric ton, as would 1167.9189 litres of lead. I think not.
A metric ton is a measure of mass while a litre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
There used to be an equivalence between the mass of pure water at 4 deg Celsius and a pressure of 760 mm of Mercury but that equivalence was abandonned in 1964.
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That is only possible for pure water. 1000 litres of water weigh 1 metric tonne. This calculation is not right with gasoline.