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Old 08-03-2013, 09:50 AM
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Join Date: Apr 2010
Location: Macomb, Illinois
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Vehicle: 2004 Quad Cab diesel
Trim Level: SLT
Color: Silver
Engine: 2005-20?? 359ci (5.9L) Cummins ISB 610 24-Valve Diesel I6 325hp 610 lb/ft
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Yeah, it is a good read. It always seemed to make sense that a cover would reduce drag. They also did the tailgate down thing, which seemed to not make a huge difference either way.

The problem is, the covers did reduce drag, but what affect does this have on fuel mileage. Also, how does the added weight affect fuel mileage. Its hard to say and that's why probably it doesn't make a noticeable difference either way. The entire idea is to keep stuff in you bed dry or not get stolen, that's what their purpose really is.
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2004 3/4 ton Quad Cab, 24 valve 5.9 Cummins
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