Quote:
Originally Posted by Isaac Zachary
I find it hard to believe that adding a cargo box at worst hurts fuel mileage by only 0.65mpg and at best increases it by 0.2mpg. 
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That is just my recorded fuel economy, not a scientific experiment. I log every vehicle expense on every vehicle including every fill-up. Those are my averages from November - March for the years in question. I have no way of knowing if the driving was similar. April - August 2021 I we have averaged 35.25 mpg. Maybe the summer tires offset the cargo box. Either way I'm not seeing a huge hit from having the box on the vehicle.
This is the box I have:
Yakima Rocketbox 11
My question is why do cargo box makers design them to be put on backward? The right side in the picture above is the front. For best aerodynamics it should be reversed with the round side in the front gently tapering to the rear. However the way the mounting works I can't flip the direction and still open the rear hatch.