In our 75-mph highway fuel-economy test, we found the fuel economy of our long-term Kia Carnival improved by 3 mpg (or 12 percent) with its factory crossbars removed. Having those bars hanging out in ...

Are roof rack bars specifically for one make and model of car or interchangeable? Can I swap between a Kia Carens and a Sportage? Roof rack bars themselves can fit between models, depending on the ...