QUOTE]when flying Economy cruise/descent changing the C.I "carries" the speed change right through the sector (i.e. it modifies the descent all well as the cruise) so ETAs should be reasonably accurate right through to touchdown.[/QUOTE]
We use CI all the time to comply with ATC-assigned Fix times. The most "econ"nomical way to minimse fuel burn whilst changing ETAs at terminal fixes?
We also play with the CI to get ourselves up higher (MAXFL changes).
Obviously the comments re updating your ETAs apply.
