Do Tonneau Covers help aerodynamics / MPG ?

[altoblue]

A few years ago someone told me to get a tonneau cover for a truck so it can be more “aerodynamic” (air trapped in the bed). Will it actually help MPG or was it just a myth? Thanks

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[JVolpe]

Ya it’s a known thing. Tonneau cover does help aerodynamics and MPG. See:

 

[NoCoolNameDave]

Ya it’s a known thing. Tonneau cover does help aerodynamics and MPG. See:

Mythbusters say otherwise

 

[Traegorn]

Mythbusters say otherwise

Sort of? Mythbusters said it was about the same as having the tailgate up without one, but didn't present the raw data.

 

[TonyS]

Probably makes no difference on MPG. But it keeps anything in the truck bed from being visible. If it's a "hard" cover it makes taking a look more difficult.

And most of us are of the opinion they just look nice.

 

[ZachSD]

I've read many things over on the subject, and a reasonable MPG gain with a bed cover is about 2 mpg. Anything greater is a plus.

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