Point of order:Personally, I'll be sticking with Efficient Cruise, because while our remaining Excaliburs are awesome I don't see us needing to group them into task forces with a Federation leader any time soon. The task forces the Federations are going to lead in practice will be made up of Mirandas... who certainly don't have quads, and I'll bet quite a bit won't have sprint.
Every ship we have built has Sprint, going back to the first Stingray in the 22nd century
The Archer-class is only 0.2 slower than the Newton at max warp, and it also had a max cruise setting
And its a cargo carrier with Cruise nacelles
The Mirandas may not have quad nacelles, but they are still going to be Warp 8 ships
They'll be much faster than their predecessors
Even the Attenborough was running around with warp at 6.2/7/8.2