Originally Posted by Bleve
scending to our best holding altitude (enroute to the destination) will help you lose time, but it won't save you fuel.
Given that the flight time to the Feeder Fix will be the same whether you go low/slow/straight or stay high and hold, you will save fuel because the holding FF will be less than high altitude cruise FF. At least that's what happens in my aeroplane, and it is significant.