11-15-2012, 04:13 AM
I believe it on the max tow mirrors. They are huge, I call them the Dumbo Ear Mirrors. I could easily see 1 MPG or more difference with them folded in versus out. The wind noise from them alone is pretty insane. When I get a new truck again in a year or so I am not going to get them again. Not so much for MPG, but they are just too damn big and it makes simple things like drive up ATMs or getting out of the airport parking garage a pain.
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