Will bars make much difference to the fuel consumption?
Posted by Elliot @ The Roof Box Company on 14 October 2009 04:41 PM

Yes - as much as 15%, depending on your driving style. Roof bars on their own can also be quite noisy. But add a roof box and you’ll find that the drag and noise all but disappears, together with the fuel penalty. Auto Express confirmed this in a recent test, using a Thule Spirit 780 box, although in our experience this is true of all the KAMEI and Thule boxes we sell. We therefore recommend that roof bars should be removed whenever they aren't being used. Whispbars, which generate minimal drag and noise, may as well be left in place full time during your activity season.

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