I think ANDREW gave the definitive answer when he said, Chrysler highly advertised this car as being autobahn tested at 150 mph. It has to have it at that speed. CHXF made a very good point about it coming up at 65 to give it a head start before it reaches a speed where it's really needed. I think we are all in agreement that "down force" is a good thing at any speed. How much down force that is created by the pop up wing at 65 mph? As I said, at the start of this thread, I thought I read somewhere it was 40 lbs. at 65 mph. Because I remember thinking to myself at the time, that's only two bowling *****. I am sure the down force naturally goes up as speed increases. At what point the down force becomes so great as to affect MPG, I don't know. From everything I've read and witnessed over the years it seems that fast back, slope back, turtle back, slant back styling (what ever) generally improves a cars aerodynamics enough to give it an edge over a notch back (flat trunk) car. But along with its advantages, a fast back seems to experience more "lift" at a similar high speed. Chrysler discovered this with their 1966 Hemi powered Chargers on the Super speedways like Daytona. The remedy was to install a very small vertical spoiler. On the other hand, Pony cars used in the Trans Am race series in the 60's & 70's spent a great deal of time going around curves and on the straights at substantially slower speeds, and yet they all used some sort of spoiler or wing to give them an edge. It even works on non-fast backs too. The alternative? A car that looks like a Porsche 917 race car, or Fords mid-engined racer the J-car, in other words, extend the back of the car out so far that it would be impractical for highway use. That's why practically every high performance sports car built since the early 60's has used some sort of spoiler, wing, or duck-tail to finish it off (at least when the cars were raced). Now I'm not an engineer and these are only my opinions, but I don't think you're going to go spinning off the road at any speed higher than 70 mph just because you choose to deactivate your wing. I do think Chrysler thinks it's in your best interest to let the wing operate the way they intended it. But since we still live in a free society, to each his own.