Charge summary savings not shown

I think I figured it out. It only populates when the charge is considered free. For example, I've charged at parking garages and if I go into the charge details and mark it "Travel Free," I have results:

It's also not showing up with for me.  I've been playing around with the settings but can't get it to work

I was curious about this as well. 

Bump on looking for savings calculations as well...

no still wondering what it is

Did you ever get a reply?