I have had some deer walk within 2 yards of mine with the windows down, and I shot one of them, Doe. I have had several deer within the 20-40 yard range come by me without ever spooking, and I got busted by a monster down wind. I do not believe he spooked because of the windows, I know he smelt me, because he was looking all around for what he was smelling before he took off. I really don't have the answer you want do I? I have had success with all the windows down, but I am brushed in really good.