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Roof wing or Roof fairing for a flat top?

I was wondering what would be the best option to help out with mpg. Will a roof wing do it or grabbing the roof fairing from a wrecking yard truck? Freightliner FLD 120 flat top to be exact.

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Go with the OEM roof from wrecking yard much better choice

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Thanks. Do you know if the cab extending fairings do anything to help with aerodynamics?

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Comments:

I have them on my 2011 Pete if they help its so small that you can't see difference but the roof does make difference if your pulling tall loads or a box.

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