5 9 l 100 km 40 mpg roof mounted thule xtender 739 ski carrier with skis.
How much mpg do you lose with a roof rack.
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.
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.
If you must travel with a loaded roof rack try to choose the most aerodynamic roof rack you can.
Disrupting airflow over the roof and causing turbulence has more of an effect the faster you drive.
It caused a whopping 34 percent drop in fuel economy or 10 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.
Of course no one in their right mind would drive around with an oversized pool float fastened to the roof of their car while it.
And since air resistance increases exponentially with speed the difference would have been even bigger at 70 mph many people drive at that speed.