Knowledgebase: Roof Box FAQs
How will a roof box affect fuel economy?
Posted by Charlotte @ The Roof Box Company on 18 March 2011 12:17 PM

Using a roof box will reduce fuel economy but probably not by as much as you would expect, usually a few MPG. Fuel economy when using a roof box will be better than if you are carrying bikes on the roof, or on a high-mount tailgate carrier, or using the roof bars on their own, so it is very important that you remove the bars when you are not using them. The exception to this is aluminium aero bars. Not only are the aluminium bars much quieter than the square bars but they create so little drag that they can be left in place without any significant effect on fuel consumption.

More aerodynamic boxes will give improved efficiency – look out for wind tunnel testing and aerodynamic features that diffuse the air around the box and bars.


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