![Fact #981: June 12, 2017 Using a Cargo Box on Top of a Vehicle Can Reduce Fuel Economy by 25% | Department of Energy Fact #981: June 12, 2017 Using a Cargo Box on Top of a Vehicle Can Reduce Fuel Economy by 25% | Department of Energy](https://www.energy.gov/sites/default/files/styles/full_article_width/public/2017/06/f34/fotw981d.png?itok=nQd3SCHG)
Fact #981: June 12, 2017 Using a Cargo Box on Top of a Vehicle Can Reduce Fuel Economy by 25% | Department of Energy
![Roof rack test: quantifying the aero penalty - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com Roof rack test: quantifying the aero penalty - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com](http://metrompg.com/posts/photos/roof-rack-chart-s.gif)
Roof rack test: quantifying the aero penalty - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com
![ARKSEN 84" Universal Roof Rack Cargo Basket With Extension Rooftop Cargo Carrier with Waterproof Car Roof Bag SUV Traveling Holder, Black - Walmart.com ARKSEN 84" Universal Roof Rack Cargo Basket With Extension Rooftop Cargo Carrier with Waterproof Car Roof Bag SUV Traveling Holder, Black - Walmart.com](https://i5.walmartimages.com/asr/453556e5-2c44-4641-b4a3-93bf167d34d9.53dfa7c175fda3e09b93d22d0caac1e3.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
ARKSEN 84" Universal Roof Rack Cargo Basket With Extension Rooftop Cargo Carrier with Waterproof Car Roof Bag SUV Traveling Holder, Black - Walmart.com
![Fact #981: June 12, 2017 Using a Cargo Box on Top of a Vehicle Can Reduce Fuel Economy by 25% | Department of Energy Fact #981: June 12, 2017 Using a Cargo Box on Top of a Vehicle Can Reduce Fuel Economy by 25% | Department of Energy](https://www.energy.gov/sites/default/files/styles/full_article_width/public/2017/06/f34/fotw981c.png?itok=Sbauv2tE)
Fact #981: June 12, 2017 Using a Cargo Box on Top of a Vehicle Can Reduce Fuel Economy by 25% | Department of Energy
![5. Percentage increase in fuel consumption for a non-laden roof box.... | Download Scientific Diagram 5. Percentage increase in fuel consumption for a non-laden roof box.... | Download Scientific Diagram](https://www.researchgate.net/publication/313885157/figure/fig6/AS:669591084752919@1536654363991/Percentage-increase-in-fuel-consumption-for-a-non-laden-roof-box-The-references-cited.png)
5. Percentage increase in fuel consumption for a non-laden roof box.... | Download Scientific Diagram
![6. Increase in fuel consumption because of laden roof box (influence on... | Download Scientific Diagram 6. Increase in fuel consumption because of laden roof box (influence on... | Download Scientific Diagram](https://www.researchgate.net/publication/313885157/figure/fig7/AS:669591088947201@1536654364031/Increase-in-fuel-consumption-because-of-laden-roof-box-influence-on-both-mass-and.png)