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I don't have any scientific evidence, but I can make an educated guess that installing a roof rack would have an immeasurable effect on fuel economy. You might lose something like a tenth of a MPG. A roof basket tends to be a little worse, but still not a big deal...
 

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I run the Yakima Mega Warrior with the extension - and it doesn't seem to hurt my 13.7 MPG!
 

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I'm getting avg. 15.5 mpg with mixed driving (city/hwy) with 4 people, a Yakima Mega Warrior basket, and a trailer hitch bike carrier.
 

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I am also running the Yakima Mega Warrior basket and get between 15 and 18 mpg. I agree with TR4Runner, I do not think the effect is much, most difference is only the added weight which you would get no matter what you add to you vehicle.
 

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I'm running a setup like Phunkeydude's, and I get about 15-16 mpg.
 

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Sidebar Question, my bad...

Those with the mega-warrior rack -- any have the extension on with sirius radio? I'm wondering if the rack screws up the antenna reception!?!

Slainte'
O'C
 

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I have the extension and have no trouble with the radio reception. You just need to be sure the cross bar is not over the antenna. There will be problems if the rack is loaded and the items block reception.
 

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Yes, any impact will be the same as if you carry the roof rack in the cargo area. I don't think the rack is going to create that much extra drag. These things already have the aerodynamics of a tool shed.
 
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