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I see no advantage for a manual clutch in hypermiling with a CVT.
The charging system of a vehicle is constantly charging the battery untill it is charged to full capacity. Why would you want to start the engine if you were coming to a stop? I will stick with electric start and use it when I need to go when the light turns green.
With a freewheeling sprag clutch, it may be better to allow a motorcycle engine to idle between power pulses rather than shut it off then turn it on again, regardless of method. I suspect smaller engines fall more easily away from stochiometric fuel ratio than larger ones. This suggests there is a difficulty in realizing measurable mpg gain by turning off the engine for short intervals because you are likely to operate in a rich condition when restarting whereas you would have been maintaining a lean condition if you had simply idled.
For longer distance coasting, shutting down the engine is optimal.
Overrunning an engine has not been discussed so I have no idea what you are talking about. An overrunning clutch is a type of sprag clutch. It is the one to use in this application.
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