A close second was the kayak with 28 percent or a change.
Mileage impact of roof bag.
2010 ford edge with roof racks and we averaged 35 miles per gallon.
Roof rack with thule dynamic 800 aerodynamic cargo box.
The gear with the most impact were the dual mountain bikes strapped to the roof which impacted the fuel economy by 31 percent or 9 mpg.
40 mpg roof mounted thule xtender 739 ski carrier with skis.
It really varies as to how much the mileage will suffer.
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.
That said some offer an extra strong hold or added security features.
Thankfully all the items on our list are very easy to install and include everything you need.
Mileage went from 41 mpg at 65 mph to 40 mpg.
Make sure if you re going to get a cargo box to go with thule not yakima.
Shield jacket waterproof roof top cargo luggage travel bag.
We love the justin roof bag roof top cargo carrier bag 19 cubic feet for example as it provides a ton of securement options that go above and beyond.
I have heard of people taking a big hit in gas mileage and i have also heard of people who claim a zero loss in gas mileage.
Thule boxes are designed much smarter imo and they re tested on the autobahn and have no speed limit whereas yakima boxes are rated only to 75mph max as well as have a history of the lids blowing open.
Made with a textile bag design this cargo carrier is a good option for drivers.
Everything in the carrier remained 100 dry the bag stayed secure with no rips or damage and we got better gas mileage than we have ever gotten with that car so needless to say we were shocked.
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.
Anytime you put some on the roof of your vehicle gas mileage will suffer.
5 9 l 100 km approx.
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.