Roof Box Fuel Efficiency

5 9 l 100 km 40 mpg roof mounted thule xtender 739 ski carrier with skis.

Roof box fuel efficiency.

5 6 l 100 km 42 mpg roof rack with thule dynamic 800 aerodynamic cargo box. The roof rack mpg experiment he compared the gas mileage of his car at 54 7 mph 88 kph with 1 no roof racks 2 an empty roof rack and 3 a mountain bike on the roof rack. As the british magazine what car. Adding a roof box means your car has to carve a bigger hole in the air which requires burning more fuel so your mpg will suffer.

Their study was published recently in the. 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. Adding any rooftop carrier cargo box or ski rack to your car significantly cuts your highway mileage all the time it. 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.

Yes more than you think. Recently found adding properly fitted roof boxes and a modest amount of cargo to a couple of compact family models decreased their effective gas mileage by up to.