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You could program your controller to accept data from the serial port. Then you could just get a series of coordinates from GPS or something, and let it drive you all by itself (allowing for input by you of course, like braking, slight left/right corrections, etc...). I actually don't think it would be very hard.
You could show your "instantaneous miles per gallon", or watt*hr/mi on a moment by moment basis, where it corrects the figure based on the amount of force required at that moment to move the car how it's moving (watt*hr/mi is actually a unit of FORCE!). Then it could be a game, so that you could drive so as to minimize that force. A direct hypermiling indicator. On a regular gas car, you have to just wonder how good your hypermiling is going. Well, there's the MPGuino.
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