It is probably very minimal, especially if it has one that is vented. Although, it could be a whole lot and you need to ship that thing to me pronto.... /ubbthreads/images/graemlins/biggrin.gif /ubbthreads/images/graemlins/biggrin.gif
Can't remember where I heard it, but I thought that the air going UNDER your car/truck caused more of a drag issue than air going over it. So drop it to the ground and put one of those rubber spoilers on the front that rubs on the ground and that should take care of that.
I put visors on both mine and noticed no change on either truck. also have put one on a ranger I owned and no change there either. although I did notice a slight increase in wind noise near the windows. /ubbthreads/images/graemlins/shrug.gif
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