For anyone who has crossbars on their roof rails how has it affected mileage? in particular I am interested systems like the gecko sports rack

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2005 Liberty CRD, 245/75R16, OME CRD Springs front, OME HD rear

Considering the vehicle has the aerodynamics of brick, the roof rack shouldn't make a huge impact.

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2006 CRD http://www.UtahPowderCoatings.com/ http://www.gorecon.com/ I'm kind of a big deal.
RL rear bumper, ARB front bumper, Mile Marker winch, Power Tank, Skids by Mopar & Skid Row, RL Super Skink Sliders, 235/85R16 MTR, Air Flow Snorkel, DTT, 4.10 gears, Frankenlift II, Katskin leather, JL Audio stereo, Rosen video.

The flat stock rail won't affect your mileage. Now on the other hand, if you mount a THULE M.O.A.B. up there and decide it looks cool, as "one" L.O.S.T. member did *AHEM* , then drive around, you'll notice about a 2 mpg loss

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2003 Renegade 4X4 5-Speed, Bright Silver *TRADED for 2013 Wrangler*
PIAA 520 Auxiliary Lights
Garmin GPSMAP 76S
DynoMax Ultra Flow SS Muffler
Amsoil Ea "Absolute Efficiency" Air Filter
Nokian Vatiiva 235/70/R16 Tires
Pixeldzn's "RENEGADE" decals
Support the 2nd Amendment - It's your right!

I have Thule Aero crossbars. Alone they make no noticeable difference. Actually attach something to them, well that is a different equation.

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2006 Liberty CRD Limited

Provent @ 43,000 km
SEGR in progress
SAMCO Sport hoses @ 48500 km
Goodyear Wrangler Duratrac LT225/75R16