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Old 02-08-2013, 04:01 PM
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Hermes1 Hermes1 is offline
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I wish I could recall the link to post here, for a nice study done on this very question. The study compared MPG with no cap, cover etc., with a cap & then with tonneau covers. The gist of the study results indicated tonneau covers gave only a very slight increase in MPG over no covering at all and caps gave only a slight decrease in MPG. Bottom line is if you need or want covering for your bed whether in a tonneau cover or cap form, MPG should not factor into the equation since the differences were insignificant.
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