I bought this for our family vacation. Drove about 1200 miles in pouring rain, 90+ degrees F heat, in windy conditions, and it's been fantastic. I don't feel my car get blown around too much by the wind, and my fuel economy only dropped by approx 10%. The only down side to it is that it's super expensive and wish it was more affordable. This is the XL on a Mazda cx50
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