-- Last Updated: May-12-13 3:39 AM EST --
Quite a long time ago, when I used to windsurf, I read that just having the racks on the car cut the MPG by 15%.
Here's a link to an informal experiment that seems to bear that out: http://www.metrompg.com/posts/roof-racks.htm
It's been my experience that having a boat on the car seems to put a noticeable dent in the gas milage. I'm considering taking my old Folbot Super folding kayak instead of the hardshell on a camping trip next week just because money is tight and gas is expensive.
So, although I have no experience with the Whispbar, I'd guess that buying an expensive but aerodynamically designed rack makes sense if you expect to put lots of highway miles on it.
Heel and Pegpads™
Classic Freestanding Rack
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