higher top end speed, I doubt, since in most cases automatic transmissions aren't geared that way when compared to their 5 speed brother. Seriously, 4 gears < 5 gears....and in most cases that I've personally seen, the auto still comes out short on the high end.
the only time not to drive a 5 speed, is in a car not intended for speed....or a car that has sevreal hundred horsepower ....300+ ;o)
- Nathan