Obviously you already know about keeping the speeds reasonable.
If you're cruising the highways, "target driving" or "driving with load" is your best bet. Fire up the
ScanGauge, decide on an MPG figure that you want to attain (within reason), and play, play, play that throttle to achieve it.
Ideally you'll have the add-a-gauge feature set up so you'll be able to watch both instant & averaged MPG on the same screen.
Long trips are hard on the hypermiler, in my opinion. The around town short trips and medium stuff is a snap.