i'd noticed it before, but even more so on a road trip to CO i just took.
basically at speeds over 60 or so, the hood will start to "flap" like it's not shut all the way. fast you go, the more it moves. (1-3 inches it seems) it seems to mostly be just on the drivers side. i'm guessing that there's just so much air pressure coming in the grill from the speed that it's pushing up against the hood from the engine bay? anyone else notice this?