Mitrend tool will allow you to get an idea of what the data efficiency ratios would be if a particular set of data was stored on XtremIO. If you scan only a particular volume - then you get the data efficiency for the data in that volume. But that is not going to account for the dedupe that you would see across multiple volumes in the real world. Your EMC account team should be able to help with more details on this tool.
As mentioned earlier, we dont report on the per volume dedupe and compression numbers in the XtremIO GUI. This is something that we are evaluating internally.