In Europe we really only use the metric system for drawings and so that is what my templates are set to.
In architecture, we tend to work in millimetres. But when we refer to areas or volumes, it is more common to use metres.
The slight problem in SU is that when you work in mm, Entity Info is also either in sq.mm. or cu.mm. and then it can be difficult to read so many digits. My plea is either to be able to switch Entity Info to sq.m. and cu.m. or, more simply, to introduce commas to distinguish the thousands.
Or have I overlooked an inbuilt way to do this already??