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Just an observation about this little experiment:
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.
Also, look at that space between the cab and the canopy... That's a pretty large space, especially towards the top. It's known that the size of the space between the bed and the cab affects the aerodynamics of the truck, and I'm sure the canopy is no exception.
Don't take my comments in a bad way, it's a good experiment! It's especially good for the owner of the truck, and people with the same or similar truck and canopy. 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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