Roof Box Fuel Efficiency

It s impossible to give an exact figure because it depends on so many factors but britain s biggest roof box manufacturer thule states that your mpg is unlikely to decrease by more than 5.

Roof box fuel efficiency.

Recently found adding properly fitted roof boxes and a modest amount of cargo to a couple of compact family models decreased their effective gas mileage by up to. Their study was published recently in the. Yes more than you think. They found that in 2015 roof racks nationwide were responsible for 0 8 percent of light duty vehicle fuel consumption or 100 million gallons of gasoline.

As the british magazine what car. 6 0 l 100 km 39 mpg thus the cargo box on the roof increased fuel consumption by about 5 compared to the baseline. Adding a roof box means your car has to carve a bigger hole in the air which requires burning more fuel so your mpg will suffer. Do ski racks and roof boxes hurt fuel efficiency.

The roof rack mpg experiment he compared the gas mileage of his car at 54 7 mph 88 kph with 1 no roof racks 2 an empty roof rack and 3 a mountain bike on the roof rack. 5 9 l 100 km 40 mpg roof mounted thule xtender 739 ski carrier with skis.