6 0 l 100 km 39 mpg thus the cargo box on the roof increased fuel consumption by about 5 compared to the baseline.
How much mpg do you lose with a roof rack.
Disrupting airflow over the roof and causing turbulence has more of an effect the faster you drive.
So if your car usually gets 30 mpg on the highway and you add a full roof rack your highway gas mileage will drop to 24 27 mpg.
If you must travel with a loaded roof rack try to choose the most aerodynamic roof rack you can.
Some drivers may see their gas mileage drop by as much as 20 percent depending on vehicle type and type of roof rack.
This editor many years ago in a move across the country to oregon from michigan found that the highway mileage of a four cylinder accord dropped from more than 40 mpg down to 32 mpg with a.
He found that compared to the baseline of no roof rack the empty rack reduced his mpg by 12 7 and the roof rack with a bicycle reduced it by a whooping 27 3.
And since air resistance increases exponentially with speed the difference would have been even bigger at 70 mph many people drive at that speed.
It caused a whopping 34 percent drop in fuel economy or 10 mpg.
Roof rack with thule dynamic 800 aerodynamic cargo box.