Quote Originally Posted by Rjk View Post
pretty much all cars can manage to do 20mph in 3rd or 4th gear though, no need to drop to 2nd
you've missed the point. and your comment about physics is a little wide of the mark. In a text book you are correct, but we don't live in a world of constant acceleration rates and constant velocities. We live in a world where speeding up and slowing down burns considerably more fuel that travelling at a constant speed.