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A real clutch would be ultimately more efficient than a freewheel though since you don't have to use the starter as much and can bump start if you time the traffic obstructions right.
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I entirely disagree. Because there is no neutral with a CVT or CC, a real clutch (as compared to a freewheeling sprag clutch) would require the operater to hold the clutch in for the duration of the glide. As I have pointed out in other posts, the throw-out bearing is sealed, without provision for cooling. It is not designed for long periods of operation, which increases the liklihood if failure.
A sprag clutch, on the other hand, allows
instantaneous coasting whenever the throttle is backed off. Obviously, a gentle matching to regain drive force will have to be practiced by the operator to prevent damage to the sprag clutch or stressing of drive components. Still, for hypermiling applications, I can think of nothing better.