Some say it does some say it hurts it. My opinion is even if it helps some it would not be enough to recoop the costs of a bed cover. Could not hurt to put one on if you want a bed cover for other reasons though.
i got any extra 1 mpg but i like it for all the other reasons keeps things from blowing off keeping them dry and still being able to roll it up and use the full box.
-2006 F-250 XLT 6.0L diesel, SCT with gearheadstunes, powermax turbo, egr delete, scan gauge II, muffler and cat delete, 3.73 gears, 139,000 miles
-1998 Pont Grand Prix GT 242,000 miles
-1992 f150 302, 3.55 gears, 4in lift, headers, true dual exhaust, no cat no muffler, 33in tires- wish i wouldn't have sold it
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