But this is the whole point. For me E-Liability is the capacity of a plane to retain energy which is the sum of speed-based energy and altitude-based energy. I do not want to go into detail but basically E-Liability in a turn for instance will depend on the lift a plane can generate by increasing the angle of attack and how much this will cause drag. The more you pull the more lift your plane generates due to higher angle of attack and the tighter you turn. Now basically ALL planes will be able to generate the same amount of lift or let's say the same amount of lift/weight. A plane however that requires more angle of attack to do so will create - by same aerodynamic performance - more drag than one that does not need this. For instance this would happen to a Spit that has a higher weight. In order to achieve same turn radius the heavier Spit would require higher angle of attack and hence more drag would be created slowing down the heavier Spit more.

Again, if the aerodynamic performance is not as well for a plane (at same weight) it would either also have to pull more angle of attack to create the same amount of lift.

Or, even if another not so performing plane can generate same amount of lift with same angle of attack, it still might generate more drag.

Now if we take into account propulsion too, we can basically say that the plane with the better thrust will be more at ease to compensate higher drag, so even if the plane would have to pull stronger for same turn radius (for instance because of higher weight, aerodynamic performance being similar otherwise) it might still be capable to preserve its speed at the same rate as the lighter aircraft if its engine is powerful enough.

So, summa summarum, it is a darn complicated story. My guess is that no flight sim ever gets so deep into detail to really come up with a good set of data. I think all flight sim FMs are based on some parameters and tweeks to fit quantitave and some qualitative criteria for each plane and hoping that for other qualitative criteria the outcome is ok.