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Brisk acceleration lowers intake manifold vacuum and opens up the throttle - these two things make the engine more efficient at driving its load. P&G uses this very concept on the "pulse" part. I use it to get 18-19 MPG out of a vehicle that is rated at 13 MPG in the city.
It's important to realize that brisk acceleration is only meant to get you to speed. If your speed happens to be timed with the upcoming traffic light, then so be it. Brisk acceleration does not mean race.
Also, if the engine goes into WOT open loop due to the gas pedel being depressed too far, and fuel delivery is enriched as a result, then there is obviously no improvement in fuel economy.
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