This is the best work yet I've seen on the subject:
http://mars.acnet.wnec.edu/~ehaffner/did.htm
Granted, it's a model of a Ram, but the principles should carry over.
Gary Shook
Penrose, CO
>Hey guys - on these tonneaus, tailgates, and MPG numbers.
>The covers do eliminate the 4' tall vertical drop from the rear edge of
>the cab down to the bottom of the truck bed, so we *should* be seeing a
>gain there, but I'm just not getting that on my dak. The drag from the
>truck's (with toneau) comes from:
>a-relatively big frontal area
>b-lots of air going under the truck and mixing with the mechanicals
>c-vertical drop behind cab to top of tonneau
>d-vertical drop from top of tailgate to bottom of bumper.
>
>Agree, disagree, impartial? any aerodynamicists out there?
>Later,
>Cale
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