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As you get ready to hit the road this summer, with the kids loaded inside and the bikes strapped to the roof of your car, you may want to stop and consider that the roof rack on your car may be costing you as much as 25 percent more in gas.

In the first study of its kind, Lawrence Berkeley National Laboratory (Berkeley Lab) researcher Alan Meier, working with Yuche Chen of the National Renewable Energy Laboratory, have estimated the fuel consumption penalty of this popular and fast-growing vehicle add-on. They found that in 2015, roof racks nationwide were responsible for 0.8 percent of light-duty vehicle fuel consumption, or 100 million gallons of gasoline.

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