[99LeCouch]

I always thought the proper way to DWL was to very slowly lose speed up the hill down to your minimum speed (60 mph here for a variety of reasons). I've definitely come into some hills doing 70-72 mph, aka the interstate speed limit around me, and very slowly lost the speed climbing up the far side. For my car keeping a steady throttle position for as long as possible works nicely.

What I've noticed works pretty well is "helping" your coast at the top of the downgrade when your RPM's and speed are low from having climbed the hill. This works very well on routes you know. On routes you don't know, you risk speeding by 5 mph or so.