When you have the advantage of experience in driving any particular sequence of hills or mountains, then you need to start thinking backwards.
Start at the end and work your way back to the beginning, determining your speeds at various points in the climb-descend sequence.
In much the way the designer of a roller coaster uses grades and overall grade to determine his speed through the system the hypermiler determines his best tactic for best mpg within his average speed target.
Rolling hills without outside traffic influences are about as good as it will ever get for mpg.
regards
mech
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