I'm not sure what you mean by "recovered." You don't calculate based on how well you squeeze the oil out of the mash. You calc based on the total amount of oil you start with. Any oil left in the mash contains the same amount of mg/ml as the stuff you squeezed out.
That said, 5.05 is damn close to 4.98!
That said, 5.05 is damn close to 4.98!