As most of my driving (>95%) is highway, my focus is on reducing the power required to move the vehicle along. And since the car in question doesnt have a lot of power to begin with, that's sure to help the cause.
Re-location of front licence plate (also acts as a partial grill block)
Smoothing of rear bumper area (previously had a parachute affect)
Increased tyre pressure 40psi (previously 36psi)
Front air dam
Replacement of mechanical radiator fan with electric fan
Replacement of points distributer with high energy ignition system
Forward facing RAM air intake