Freeway driving and high ICE is very easy to achieve. This is the best way to maximize freeway speeds mpg: #1) Goal: keep battery charged as high as possible. The c-max will do this automatically when ever it gets run down low enough charging takes precedent. #2) Use cruise control. When driving, as the freeway rises and tops over a hill the EV mode kicks in. As long as, it is below one bar its not using much of the battery so this mode is fine. #3) rounding into a flat section from a downhill EV mode continues and it will rise about 1 bar. At this moment, give a quick engine rev on the gas peddle. the ICE kicks on...and stays on. Generating that high ICE mpg we all like.