If you don't want the extra drag, take the peak off for the interstate. Its only logical that all DS helmets are going to be caught by the wind some @ speed with that peak sticking out there even 3". Heck the fake DS helmets with useless dirt abilities will catch air, just look up at 70 mph or so.
Limit head checks with good mirrors!
Sombody should have bought that xl version by now and given us the play by play.
Ride more work less guys.. gotta test... R&D ya know..