I'm not sure that I understand your point re. volume. Test e is essentially a mixture of 180mg test and 70mg ester - yielding a total volume in the ampoule of 250mg/ml. Thus, I don't believe that I am injecting 27.5mg of "actual testosterone" but 19.8mg of testosterone when you take the ester into account. Am I missing something?
I think you understand it, but you're not stating it quite right. And at the end of my previous post I said "ester" when I should have said "testosterone ester," which I have corrected. Your particular liquid solution contains 250 mg (weight) of testosterone enanthate for each milliliter of solution (volume). Because the volume of the ampule is one milliliter, the weight of testosterone enanthate in the ampule is 250 mg, of which 72%, or 180 mg, is testosterone and the remaining 70 mg is the ester.
So as you observed, if you're injecting 0.11 mL then injected testosterone is 0.11 mL * (250 mg/mL) * 0.72 = 19.8 mg. But in general you would just tell people that you're injecting 27.5 mg of testosterone enanthate EOD.