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Read only the first 3 pages of this marathon thread, so I am sure I'll cover points all ready discussed.
An instantaneous mpg based CC is a bad idea, IMO, for the simple reason that driving for mpg requires strategy. And strategy requires some morm of intelligence, which machines can't do. I suppose it could be done if GPS and detailed topographical maps were incorporated. This would allow the system to know what was ahead and know whether it was a good idea to coast or build speed.
I think there is a type of CC that could be used with automatic trannies. My idea is to incorporate P&G. The P&G mph range could be adjustable as a wider speed range could be set for higher efficiency or a smaller range set to keep other drivers from killing you. Perhaps that might even work with manual trannies if you tied it in with cylinder deactivation as is used in some engines already. But, in this case, all cylinders would deactivate.
Of course, all of this is available today. It's called driver involvement. Personally, I think more driver involvement is a good thing, as involved drivers are inherently safer than the typical zombie you find behind the wheel today. In fact, since I have been reading this forum, I have used aggressive hypermiling as a defense against what I believe is, by far, the number one driver safety issue, driver fatigue.
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