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From the 100+ hypermiling tips:
44) Cruise control - when not to use it
Only use cruise control on flat roads. On hilly roads, cruise responds to changes in grade - by feeding in more throttle on the uphill and releasing on the descent - in the exact opposite way an efficient driver would
56) Drive with load (DWL)
AKA "target driving". Put most simply, this technique is accomplished by choosing a "target" rate of fuel consumption and ensuring you don't fall below it on hills (or in very strong winds, or any conditions which cause load to vary for a given speed).
In other words, you will back off the accelerator and lose speed (possibly also downshifting) as you climb, and gain that speed back on the descent.
It's far more efficient than pressing the accelerator more and more to maintain speed on the way up a hill and then releasing it down the other side.
DWL is how an efficiency minded person can greatly outperform cruise control in hilly terrain.
Obviously the ability to use this technique without adversely affecting other drivers depends on the traffic situation.
As well, fuel economy instrumentation is required to DWL/target drive to the maximum extent, though it can also be done using a vacuum gauge, and to a much lesser extent by the seat of the pants.
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