In my truck I would do the same as wyr.. just enough throttle downhills so I can hear the whine of that light loading on the rear end gears. Out of boost, but negating any engine braking.
But I'm talking a box on 65-85mph highways. Air is the major factor for my driving of hills. You don't really want to be throttling hard downhill no matter the situation. Air resistance would eat up your fuel. I'm not sure what kinds of speeds the other posts are talking about, that would make a big difference.
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