I think there is no way to print out the _Volume in Liters unless one is modeling in decimeter units. But who is modeling in decimeter?
The available options in _Volume are:
Units ( ModelUnits Micron Millimeter Centimeter Meter Kilometer Microinch Mil Inch Foot Yard Mile ):
Most of them are useless (at least for my work;) . I’d prefer to use liters for a range from 0.1 to 10000+
If possible please call it “Liter” and not cubic decimeters
Don’t know about other imperial units like gallon, barrel, …