Hi Barwelle - welcome to the site....
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Originally Posted by Barwelle
The canopy on that truck is very boxy, which obviously will increase its drag. Most of the canopies on trucks (atleast, most of the ones I see) are rounded off, and have a cleaner profile than this one.
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IMO, the biggest problem with the cap shown is that it appears to be wider and slightly taller than the profile of the cab. Add to that the sharp corners on those projections, and yes, it's going to be worse than a new cap.
But probably not
dramatically worse. The problem, as andrewj pointed out is the size of the trailing wake - that's where most of the drag is. With a cap - rounded corners or not - it's going to be big, nearly 100% of the size of the projected frontal area.
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I just wanted to point out a couple of things that could change the results that, I'd say, the majority of other people would get if they did this. I plan to do a similar experiment this summer, except I plan to do it with a week, or a month, for each different setting.
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I'd love to know what you're driving and how you plan to test it.
Note that testing by the month or tank will produce much less accurate data than these guys got, because you can't control for weather, temperature, different trip profiles (speed, traffic) etc.