I went from ~18mpg to 29mpg in town on my 1990 Accord with P&G. I accelerate at near WOT till I hit around 2200rpm, then shift. Given that my peak torque is in the 4.5krpm area, I can't see accelerating to that point as efficient, especially considering that's where I shifted before I started hypermiling, and it resulted in my awesome 18mpg.
I guess I wont know for sure till I get my carputer going, and can log fuel consumption and acceleration together and generate a rough BSFC map...