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Old 03-27-2013, 10:26 PM
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becact becact is offline
Dodge Ram Forum Senior Member
Join Date: Mar 2013
Location: Texas
Posts: 89
Gender: Male
Vehicle: 2013 Ram 1500
Trim Level: SLT V6 Big Horn
Color: True Blue
Engine: 2013-20?? 220ci (3.6L) Pentastar 305hp 269lb/ft
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becact is on a distinguished road

With modern day aerodynamics, it really doesn't matter:

AS you can see the air doesn't even go into the bed. On older trucks, it's been shown (in wind tunnels) that with the tail gate up, the wind hits the tailgate, swirls up, and forms a high pressure zone that the air rides over (much like the above image, actually). I think tonneaus for MPG is a myth. Buy one because you need or want one, not for MPG!
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