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Perhaps what you're looking for is more like an auto P&G? I've given some thought to this idea myself. You'd set your "target" speed the same way you set your cruise control speed. The problem is that this system would have to be able to disengage the engine and maybe even cut the engine as well as popping the clutch to restart if it needs to accelerate or if you tap the brake. This isn't something that would be possible on a manual transmission vehicle, but might be possible on a car with an automatic transmission.
I'm still doubtful that you could actually do something like that, but it's fun to think about.
On the more realistic side of the fence, maybe rather than trying to set it to stay at a fixed mpg, you set it to your speed like normal, but rather than trying to get to that speed as quickly as possible and stay there, it uses an optimal throttle to maximize the mpg to get there and stay within 5mph.
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