Descend speeds!

[Cornelis]

Since a few months we started descending always with the same speeds. (290/.84..B747-400ERF). According to the chief pilot it saves fuel.
Since the 747 operates in a wide range of weights I would say the best speed to fly would be the best lift over drag speed and varies with weight and should be optimized every time. Opinions......anyone :confused:
Thx

[Desert185]

In my experience flying the 747, I would adjust the descent point depending on weight. Bgin descent earlier for a heavy airplane and later for a light airplane.
With landing weights varying from 630K down to 400K on the -200's descent rate can change considerably. So (generally) fly the same speed and vary the descent point according to weight to fly a flight-idle descent (ATC/traffic permitting). My game was to save fuel by managing energy. FMS VNAV descents are another story.