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Does FJ Air Dam Help Fuel Mileage vs Just The OEM Roof Jack

I've seen several posts on these forums that talk about the FJ's roof rack knocking off as much as 2mpg. I can understand the drag factor due to the design of the rack, but then I see the 2008's have what appears to be a new "Off Road Lights With Air Dam" option. It would seem to make sense that the addition of the roof rack with the air dam/lights set up would help airflow over a otherwise chunk of tubular metal parked on your roof.

Has anyone had the air dam/lights option installed and then seen any difference in their mpg vs the install of the standard roof rack ~ or am I just dreaming?


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