How Much Mpg Do You Lose With A Roof Rack

And since air resistance increases exponentially with speed the difference would have been even bigger at 70 mph many people drive at that speed.

How much mpg do you lose with a roof rack.

Roof rack with thule dynamic 800 aerodynamic cargo box. 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. It caused a whopping 34 percent drop in fuel economy or 10 mpg.

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. 5 9 l 100 km 40 mpg roof mounted thule xtender 739 ski carrier with skis. 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. 6 0 l 100 km 39 mpg thus the cargo box on the roof increased fuel consumption by about 5 compared to the baseline.

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.