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Everyone is right, but it depends on the vehicle and the hill, not even close to a written in stone tactic.
If you can coast down the hill at your desired speed, or even a lttle less, you have the best possible scenario for mileage. That hill makes your car a hybrid with gravitational energy storage. Pulse up the hill and engine off coast (or engine on if you fear EO) and glide down the hill. You mileage uphill will be low, maybe less than half of your average, but downhill you will be getting literally hundreds (infinite if EO) of MPGs.
Every other hill from way too steep to way to shallow requires some modification of the tactic and it also depends on your vehicle, since some will coast at higher speeds down the same hill compared to others.
regards
Mech
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