Roof Rack Gas Mileage

So it varies depending on the vehicle on the rack and on the driving highway or city but it s at least five percent and probably a lot more.

Roof rack gas mileage.

Generally adding a loaded roof rack to your car will lower your gas mileage by at least 10 percent. 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. The roof rack mpg experiment. 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.

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. Some drivers may see their gas mileage drop by as much as 20 percent depending on vehicle type and type of roof rack. Mileage went from 41 mpg at 65 mph to 40 mpg. The control test the tourx without roof rails.

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. Drag coefficient increases by speed squared. Let s say that you drive 15 000 miles per year gas is 2 50 gal and your gets 25 mpg.