Most Fuel Efficient Roof Box

The claw attachments make it easier and quicker to mount and remove the box.

Most fuel efficient roof box.

The control test the tourx without roof rails. A former rolls royce aircraft engineer was hired to take yakima s racks to the next level and we have him to thank for the wispbar s wind cheating aerofoil wing profile. If fuel consumption is a concern invest in a streamlined box which will cut through the air more efficiently. Keep in mind that your car uses more fuel when it has a roof box attached our test car used 12 1 more fuel with the roof box fitted than without.

It s impossible to give an exact figure because it depends on so many factors but britain s biggest roof box manufacturer thule states that your mpg is unlikely to decrease by more than 5. Off the showroom floor the regal tourx gets 21 miles per gallon in the city and 29 mpg highway for a combined fuel economy of 24 mpg. 30 5mpg astra s baseline fuel economy. For comparison the additional fuel consumption caused by roof racks is about six times larger than anticipated fuel savings from fuel cell vehicles and 40 percent of anticipated fuel savings.

Bengt halvorson april 15 2015 comment now. Roof boxes fix to your roof racks either with a basic u bolt system or a claw style attachment. If you follow our coverage on fuel efficiency you know that real world mileage numbers don t always measure up to the official epa ratings. 30 4mpg two front windows a third open 30 3mpg roof bars and laden roofbox 30 2mpg two front windows totally open 29 7mpg four tyres.

But if you.