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Tonneau vs Cap/Topper/shell
I have seen multiple reports on possible efficiency improvements between the tonneau cover vs the cap/topper/shell for pickups. I won't be able to do anything like an aerocap as I just don't have the skills or the time to take on such a project at the moment and I haven't seen anyone selling them yet. But I am interested in efficiency improvements while helping me with securing my truck with my cargo.
I have a topper/shell on my old truck and was interested in doing the same on the new truck until I read the data here that appeared to show mixed results of using a topper. So now I am trying to understand if it is going to be a detriment to put on a shell/toppper/cap or an improvement in my fuel economy over that of a tonneau cover. What are your thoughts or inputs on these two aero mods and what will give me the biggest improvement between these conventional additions to a pickup? I know the half tonneau over the back is a bigger improvement over a full cover, but I don't know anyone selling one, or the ability for me to secure my cargo in such a configuration.
What are your thoughts? Thanks.
Longsnowsm
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