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Conventional cruise control systems do the opposite of what us ecomodders want. It's not speed that you want to hold, its engine load, as that will produce a near constant fuel economy throughout your trip. By holding engine load, your vehicle will use speed it gained from a downward slope to climb up a hill, and likewise regain overall speed after climbing a hill on the next downward slope.
Basically, if you can manage it, try to use a constant foot position instead of the cruise control.
Ofcourse, P&G on the highway will produce even better gains, but that's more of an advanced hypermiling technique.
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