Any one knows what the difference in full consumption is if you modify the descent speed from CI (around 270kias) to say 300 on a medium size aircraft? You'll keep cruise power a few minutes longer but your descent will be shorter, taking advantage of the higher GS/TAS.
I've done this to save a couple of minutes when going behind schedule but don't know how does it affect fuel economy (haven't done the fuel gauges vs computer flight plan math to be honest).