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I know that there are some guys who've experimented with economy tunes. Some of the commercial maps clean up excessively rich areas of the map while still giving more power.
But the gains from this aren't huge. A little bit here and there. To create a tune for maximum economy means running things very lean in areas, which leaves less margin for error when you get a batch of bad gas or if the weather gets too hot. It takes a lot of development, and I don't know if there's enough of a customer base for this to be commercialized. (I mean, a lot of people might want it, but how many are willing to pay? And you'd have to develop a "safe" map for each model you support...)
Some newer cars already come with such maps for their "Eco modes", and they include dialled back timing, dulled throttle response and altered transmission algorithms.
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