lomapaseo, it's just common logic.
Thanks for the data Turbine D.
Source for data?
No doubt about it, the 90 is a steam engine having chomped down too many hamburgers. I wish they would hurry up and refine it some more and incorporate some GEnx technology into it such as a composite fan case, strain gauge some of the metal in the casing to see if it could go thinner walled. Possibly the disks could go thinner walled as well.
The fan dia on the 90 at 13 more inches will be more drag.
That SFC cruise burn for the Trent at 495lbs more cruise thrust is almost double that of the 90 !