If there is a climb ahead I will gently accelerate down a hill, to build up some momentum for the climb ahead. A bit of light throttle there, uses a lot less fuel than starting the hill at a lower speed and having to burn fuel to get up it.
If there is no climb ahead I would probably coast down the hill, or take advantage of DFCO. The last thing you want to do is accelerate down the hill, then have to brake because of a bend or other hazard to be negotiated.
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