-- 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.
Canoe / Kayak Anchors
Gedi Convertible Helmet
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