To be honest, I have no idea. I will say this, a few years ago, I booked an outfitter in Pike Co, IL. He drove a full size suburban. As we approached a greenfield, it was already loaded with deer. He drove me to the base of my stand. He said "they will be back". I got out, climbed the ladder stand, he left, and in about 30 min, all deer were back, and walked right under my stand. Granted, none in the field were shooters, but, it did happen none the less. Here in AL, I think they are extremely "weary" and whatever we can do to mitigate sounds, can only help.