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I'm guessing the ICE is on at speeds above 45 just based on normal ICE needs for a hybrid at those speeds. If you are COASTING down hill and maintaining highway speeds the engine is probably getting in excess of 200 mpg anyway. The instantaneous MPG display on my fully ICE V8 AWD vehicle maxes out a 200 mpg and if I go above that the display just shows three horizontal lines. That's usually what happens to the display when I am able to coast down hill at highway speed so I wouldn't fret too much about waste if the engine running under those conditions. May also be a function of fluid circulation for the trans since the drive train is still turning a good portion of it at highway speeds. Or could be related to a smooth transition back to ICE power at that speed should it be needed. I'm sure the engineers at Ford have good reason(s) for leaving the engine running with the vehicle moving at those speeds what ever it is/they are. As for the AC both it and the power steering pump run off a separate electric motor so they can function when the ICE is off. This is common to all ICE hybrids. AC not working when the ICE is off would be a nuisance in a hybrid and probably a deal breaker for most people. The power steering not working when the ICE is off would be down right unsafe.Report it
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