Dink is right, but you have to find the balancing point. I've actually found in my Pickup that accelerating slowly LOWERs my MPG, but jack rabbit type starts also lower it. If, like Dink says, I go on and get up to speed, my MPG will hang around 18 - 17.6 (in the truck). If I go to fast, or too slow it drops to 16. The question is what RPM range would be the best for acceleration? I would think somewhere around where the torque is highest.
The problem is that most folks around you think you are drag racing, or something, because they're still under that false impression.