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FYI
A friend of mine that is a Prius hypermiler, has found that Toyota has a patent pending for a MPG tuned cruise control that is tied into a GPS and terrain maps.
The principal is that the cruise control will always know where you are, and what the terrain is, and will use smart software to tune the electric to gas ratio for optimum MPG.
No idea when we may see something like this, but I suspect it will pretty soon.
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