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Speeds as high as 75 MPH with automatics. I have used in gear downhills on my manual VX to keep from being sucked into the rear end of an 18 wheeler coming back from Blacksburg at 85 MPH on a 3 mile 6% grade in the mountains.
Going downhill depends on your speed and whether it is increasing beyond your comfort zone. If your objective is to keep your speed below a certain point than use engine braking (and possibly fuel shut off) to get infinite mileage for your descent.
Where I live there are no downhill grades that steep. Only hills where I would use that technique are an hour west of my home, where grades can be coasted for a mile or more further west.
regards
Mech
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