- First Name
- Brendan
- Joined
- Sep 16, 2021
- Threads
- 7
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- 540
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- 1,482
- Location
- Orlando, Fl.
- Vehicle(s)
- '22 Prius, '19 Indian FTR-S, '20 Mustang EcoBoost
Watch the old episode of Mythbusters. I believe they found pickups are most efficient with no cover as the airflow is factored in. It almost creates a "bubble" of air that pushes the air over the tailgate. The cover just allows the air to dump right on top of the cover, create downforce, and increase drag, almost like a spoiler. Of course a lot has changed since the early 2000s and modern aerodynamics could be much different. I miss that show...I wonder how many additional MPGs the tonneau cover provides. I imagine the reduction in drag adds efficiency...
Edit: I should edit this for everyone not reading all the pages of the thread. Turns out I was mixing up multiple Mythbusters episodes. A cover is more efficient than no cover at all, however tailgate up is more efficient than tailgate down or a mesh tailgate due to the bubble effect I mentioned.
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