[superbenk]

Tailgate up/down is very different than a tonneau cover or bed shell cap, isn't it? I'm skeptical of the full 10% gain as well, but I bet a cover gets you some improvement. But it seems you're comparing apples to oranges with the Mythbusters video & your question.

EDIT: I looked at the video again & forgot they also tested with a hard tonneau so scratch what I said above.

 

[superbenk]

I remember the episode well. I'm still not sure I get how the mesh is any different than the tailgate down or why it would get better than the tailgate up. The tailgate up doing better than the tailgate down makes sense to me, but the mesh doesn't. Maybe I should watch again...