I thought this article was interesting:

http://www.statesman.com/hp/content/...2/3CARCOL.html

The author drives a Prius and prefers the 06 Prius over the 06 HCH, but expects the 06 HCH to get better mileage.

I got my best trip mileage so far yesterday. 55 MPG one way on my 28 mile almost all freeway commute. Cruise control @ 60 MPH the whole way. Very little of this is flat, it's mostly gradual rise & fall.

I've also tried DWL, but I still can't beat the cruise control mileage. I can keep the instant FCD at about 55 MPG most of the time, but it's not enough to get me to the tops without dropping below 50 MPH, and I'm going so slow at the tops that I don't get a chance to build up much speed on the downside (again keeping FCD above 50). With cruise, the FCD drops down into the low 30's on the rise, but peggs at 100 on the downside, so the average is about the same I guess. I'm guessing that DWL works better on hills with a shorter distance from the trough to the crest where you have a better shot at coasting most of the way up the hill without losing too much spped. Or I just need more practice.