In my Civic CX (non-hybrid) I try to keep the engine in its more efficient power output band (70% to 80% throttle, RPM's below 3000, and accept whatever legal speed below 65MPH that power output will give me. I try not to ever floor the throttle during a hill climb (or during accelleration) since this causes the engine controller to adjust the fuel/air mixture to full rich to try to extract every last possible erg of enegy from the engine. Traffic permitting, as I approach the crest of the hill, I will release the throttle, push in the clutch and let the speed drop to 1/2 to 2/3 my original speed as I pass over the crest of the hill and then take the gravity ride down the other side.