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Interesting idea and would be of great assistance maintaining throttle position going up hill. You may be better off building a instantaneous MPG meter, see MPGuino. Then trying to keep the reading above the MPG you are trying to obtain. This type of device can help you find speeds at which your car gets higher mpg than a couple of miles per hour on either side of it.
But do let us know what you do and the results you achieve.
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