Roof Rack Gas Mileage

The empty roof rack had a nearly 2 percent impact on fuel economy which translates to a little more than three quarters of a gallon of gas.

Roof rack gas mileage.

The control test the tourx without roof rails. Your fuel cost is ten cents mile or 1 500 year. Drag coefficient increases by speed squared. 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.

Generally adding a loaded roof rack to your car will lower your gas mileage by at least 10 percent. Some drivers may see their gas mileage drop by as much as 20 percent depending on vehicle type and type of roof rack. The roof rack mpg experiment. Mileage went from 41 mpg at 65 mph to 40 mpg.

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. 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. 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.