Roof Racks and Baskets and Mileage -
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Unread 04-04-2008, 11:06 AM   #1
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Roof Racks and Baskets and Mileage

I had someone recently say that the cross rails of the roof rack can eat up as much as 2-3 mpg having them mounted. Can anyone confirm this or provide links to studies in this? What about baskets? I am sure they do as much more metal and drag is involved but I was surprised at the roof rack cross bars.

I am about to get the Rola roof rack basket and the Platypus soft cargo carrier bag. If anyone has the basket, are you happy with it? Did you get the extension as well?

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Unread 04-04-2008, 11:16 AM   #2
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I have the Mopar crossrails on my Jeep all the time - haven't noticed any loss of MPH yet still hovers around 22

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Unread 04-04-2008, 06:00 PM   #3
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I've got the cross rails as well but only put them on if I am going to need them. It is easier to clear the snow off the car without them and the SAT radio works better....

I did notice a bit more wind noise with them installed but no real difference in fuel economy...
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Unread 04-04-2008, 06:07 PM   #4
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I took the rails off both the ltd. MK's I bought. There's the MPG considerations (even though I think it's small) and there's the snow issue as well. I can understand leaving them on if they're actually used, but if not...

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Unread 04-07-2008, 01:16 AM   #5
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2008 MK Compass 
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I've got the Sport Utility bars on my Compass, and have noticed no significant drop in mileage or increase in noise.. The increase in frontal and wetted area from the bars themselves (compared to the vehicle without) should have a fairly minimal drag impact.. save for, perhaps, some vortex effects from the mounts they shouldn't produce _that_ much drag. (Unless you're planning on taking your compass supersonic any time soon.)
Slap a Thule Atlantis 1600 roof box up there, and then you're talking nontrivial drag effects..
Hmm, wondering if I could build a wind tunnel model of my Jeep now.. :P
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