MPG Test Result, Tailgate up/down
Post Fiend
Joined: Jul 2005
Posts: 8,462
Likes: 4
From: Durant, OK (SOSU)
My dad got a box for his GMC and didn't notice any real difference. The vortex is still there, just shaped differently.
It does make stuff in the bed do some weird things though. Items get trapped underneath the box and there isn't any airflow above the box at all. The air goes over that "vacuum" and into the vortex behind it.
It does make stuff in the bed do some weird things though. Items get trapped underneath the box and there isn't any airflow above the box at all. The air goes over that "vacuum" and into the vortex behind it.
Elder User
Joined: Nov 2004
Posts: 759
Likes: 0
From: Ventura ,ca. (near L.A.)
One thing i never relized until the vortex thing was brought up, In my chevy i have a sliding back window and i remember a couple times getting hit with a mcdonalds bag and once with a coke can while driving down the freeway with trash in the bed. So the whole vortex thing makes perfect since.
It would have been interesting if mythbusters had a 3rd truck in the test that had it's tailgate removed, and a fourth that had a fiberglass bed lid. That would have been intresting to see.
It would have been interesting if mythbusters had a 3rd truck in the test that had it's tailgate removed, and a fourth that had a fiberglass bed lid. That would have been intresting to see.
Post Fiend
Joined: Jul 2005
Posts: 8,462
Likes: 4
From: Durant, OK (SOSU)
Yeah and throw some random other things in there. Like try and make a more efficient shape for the rear. Try those God-awful spoilers the Dodge kids think are cool on their trucks and see what they do to it. Would be interesting to see!
I learned my lesson, leave the back window closed on highways or get bubble wrap and toilet paper in the face (long long story).
I learned my lesson, leave the back window closed on highways or get bubble wrap and toilet paper in the face (long long story).
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