I'm not sure I want to know what my Cd is with them on my roof rack. I know it is really bad since I lose between 6 - 12 mpg. This past weekend I only got 27.x mpg on a kayak trip when I have been getting between 34.5 and 36.x mpg without them. I should probably take the time to determine my car's Cd with and without the kayaks to give me something to gage where I am at and how to improve on it.
On another note, I am doing better than many of my kayaking friends. They always tell me to quit complaining and that they would love to get the mileage that I get.
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