The Ultimate Honda Civic Hybrid Hypermiling Guide
From CleanMPG.com, user tarabell posted this excellent article complete with scientific experimentation testing various driving strategies with the Honda Civic Hybrid. The article goes into depth about why various approaches work better than others, how to drive on flat roads vs. hills, why you shouldn't run at higher than 1900 rpm, and why slow = better mileage. There's even a hack to gain an extra .2 mpg by disabling some electronics features (I won't spoil the hack, you'll have to read the article for yourself).
Read: Adapting Basic Hypermiling Techniques to the HCH-II