Jim, as 180 pointed out the spoilers real purpose is to prevent lift. At Autobahn speeds the back end can get pretty light.
That's why there is an audible warning at around 95 mph to let you know that your wing (when it's been shut off) is still in it's lowered position at a speed that it's really necessary.
Most all of my driving is at speeds well under 80 mph. On the rare occasion I travel faster than that (like trying to keep up with the Chicago crew on their way to Carlisle) then I put my spoiler up. Also, if I get caught in the rain on the highway, or on a very windy day.
Cruising with traffic at 75 mph I feel no difference in the way the car handles with the spoiler up or down. As an added bonus, my car got better gas mileage with the wing down. https://www.crossfireforum.org/forum...e-vs-wing.html
The main reason I installed a kill switch, is because it seemed as though everytime I got on the highway and started to accelerate, some tuner boy would see the wing go up and think I wanted to race. It was almost like wagging a red cape in front of a Bull (even though they're color blind).