If fuel consumption is a concern invest in a streamlined box which will cut through the air more efficiently.
Thule roof box fuel consumption.
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.
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.
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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.
So gallons used without the box per 3 passengers gallons used with the box per 4 passengers.
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G with box d m g without box d m 3 d m 1 3 d m 3 1 4 so as long as you are observing more than 12 mpg normally it makes more sense to use a thule with 4 people.
It has a distinctive shape that has been optimized using advanced computer simulation reducing the impact on fuel economy and providing a quiet ride.
Roof box how much does fuel consumption rise.
The control test the tourx without roof rails.