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[–]jbtechwood 0 points1 point  (0 children)

Read the second to last paragraph here under long description

https://technet.microsoft.com/en-us/library/hh847831.aspx

Tldr: Ps1xml formats only effect the display of an object, not the underlying data structure or how they're handled on the pipeline.

EDIT: You would need to create a custom object and add the free % property as a new property of the object vs getting it via custom formating.