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Daox,
On my ecomodder Prius thread PA Prius is reporting 60+ mpg highway with the cruise set and AC on. My buggy is so base I don't even have cruise! I struggle on highway driving (max 58 mpg) and have been using IGN timing on the SGII to get my best mpg but PA has been more successful than me with his cruise.
The biggest disadvantage I found going from the 4runner to the Prius was not being able to neutral coast at higher speeds due to potentially over spinning the engine...still working on my highway technique. But if your wife was getting 60+ mpg highway with the cruise on PA might be on to something.
Alot of guys over at priuschat have ditched the 14 IGN magic number (Super Highway Mode) on SGII and have moved on to higher mpg's using other methods. I just haven't driven that many highway miles to test it out yet. Maybe you can get it down and find a better method than SHM.
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