i sit pretty upright on account of arthritis in my neck. i can get a little more aero but generally i just figure i am going to go slower.
i have a brooks seat cover that has a pic on it of a guy riding over the north pole. sometimes i think if i just kept the wind at my back and went over the north pole it would be a quicker ride home. its a wonderful thing to get to complain about the wind. imagine not getting to ride.