Thule Roof Box Fuel Economy

The control test the tourx without roof rails.

Thule roof box fuel economy.

Adding any roof box increases frontal area of your vehicle of course. With thule motion xt thule is setting a new standard for modern roof box design with a stylish silent and easy to use box that will make your car look even better. Mileage went from 41 mpg at 65 mph to 40 mpg. 6 0 l 100 km 39 mpg thus the cargo box on the roof increased fuel consumption by about 5 compared to the baseline.

Berkeley lab says that roof racks cause as much as a 25 percent loss in fuel economy and accounted for almost 1 percent of national consumption in 2015. 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. Roof rack with thule dynamic 800 aerodynamic cargo box. 5 9 l 100 km 40 mpg roof mounted thule xtender 739 ski carrier with skis.

It has a distinctive shape that has been optimized using advanced computer simulation reducing the impact on fuel economy and providing a quiet ride. 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. It has a distinctive shape that has been optimised using advanced computer simulation reducing the impact on fuel economy and providing a quiet ride. 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.