Curious: I flew for one operator (B737) who was on a fuel saving spree. The CI chosen gave 245kts in descent after mach changeover. They still manually entered 250/100. How daft was that??!?
Apologies if I am missing the tone in this, but surely that makes sense (albeit over a somewhat pedantic 5kts) as if they leave it alone they will have a decel point at FL100 from 245>240.