Getting better MPG from harder acceleration?

[Skydiver]

I have a question. I always baby my truck and have noticed the fuel mileage improves when I push the go pedal just enough to begin to spool up the turbo(more air). Truck runs mostly on 2-lane back roads. When I just barely feather the fuel pedal I get 18. 6 mpg. Now that I am driving slightly more aggresive I get 22. 3 to 24. 4 MPG. Truck is completely stock.

Is this because the turbo is adding more air?

Happy,Happy & Happy

Tim