I can't say for sure. Today I just set the cruise @ 55 and went. I have found (without the phev) that there aren't much in the way of gains to be had at highway speeds on the Prius by using any specific techniques. Around here there are too many hills to make super highway mode work. Warp stealth (what Darin described) may work better now with the phev kit installed. Previous to the kit being installed, warp stealth showed basically no increase in mileage. So, we'll just have to see.
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