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In practice, reading off of instant meters on various cars, it's more efficient to pursue load or to use a pulse-and-glide with hills than to maintain a constant speed over them... even a slower speed.
Aero drag going downhill hurts. Gravity drag going uphill hurts more.
Tried it several ways when researching for a Shell eco-seminar. It's more effective to allow speeds to vary on the hills on my regular highway route than to go over them at a constant slow or fast speed.
It works. Never mind whether you think it does or doesn't, it works. Gravity > Aero.
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