All the transformer losses and test can be refer back to the transformer manufacture. I am sure they do keep a copy for all the test done, before the transformer is delivery to you.
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Management is just like a bunch of Monkey sitting on a tall tree. Some climb to the highest branch and some at the lowest branch. The highest Monkey look down and see a lot of happy faces but the lower Monkey looks up and see nothing but all the....
As SW said this can be only answered by the manufacturer but there are a few guidelines now (in case you want to procure)
These are under the MEPS requirements (Min Energy Performance Standards)
Cenelec HD 428/538 , NEMA TP1/TP2 and IEC 60076-8 etc are also applicable
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