after a few brands and different types of cars I now have Whispbar. Previous "aero" type bars (brand not available in USA) were noisy and a real pain on long distance drives. With the Whispbar there is no noise but I can't tell about gas mileage as I drive to aggressively to make a make that really count.
I prefer the solid attachment of riveted-on car roof style (no clips) eliminating the risk of accidental loss of rack and kayaks. I have the "through style" where I can have the kayaks laying hull side down as I found having them on the side deform in the summer heat.
For detailed images of install and review: http://gnarlydognews.blogspot.com.au/2012/12/review-best-roof-rack.html
Touring Kayak Paddles
Electric Kayak Motor
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