Brake issue and mileage?

[HudsonValleyTitan]

Well all...I go in tomorrow to have the brake "judder" TBS performed (no real brake issues yet but...friends at dealer said to do it).
My main reason for the post is this...I spoke to a good friend who is the parts manager at the dealer and says that Nissan IS replacing rotors and calipers in the near furure (no new news to most of us) but the reason for the brake problems are NOT undersized rotors/calipers, but calipers that do not fully release..causing the rotors to overheat and warp.
My question then would be....will our mileage go up once these new calipers are installed because now we all won't be driving with all that extra drag. Any thoughts?
I'd laugh my butt off if dragging brakes were causing the "grade logic" effect on down-hills!