this question is regarding top of descent calculation,
my previous knowledge is, that starting the descent earlier for a thrust idle descent, saves fuel because the engines throttle down sooner rather than extending the cruise.
(this technique requires lowers speeds to increase glide ratio)
but looking at the airbus literature, the DPO software is extending the cruise phase. id like to understand why.
i am aware of the benefits of DPO at bottom of descent as i always performed in a similar way in selected mode.
https://services.airbus.com/en/fligh...mediagallery-1