I am picking op an 08 sport manual and am wondering if anyone has the mpg numbers I can expect with a roof rack / wind fairing / bike tray on it.

 

i lost 1-2 mpg putting mine on.

 

havent noticed any difference except wind noise

 

well... '08 Sport Automatic; I added the roof rack, fairing and a sky-box 18 last summer for travel lacrosse and it was probably an avg 3-6 mpg depending on incline and desired speeds. At 70-75 mph going up the mountains of TN we logged the worst MPG to date at ~26 mpg.

So as you already know, it will affect your mpg but does it really matter?
If mpg is a concern, pick up a under mount receiver and a bike rack as it may be more mpg friendly.

 

Thule 50" square cross bars and 480 traverse without a fairing caused a 1-2 mpg drop on my 07 sport AT.
Fairings, though designed to help mpgs and aerodynamics. They mostly just reduce loud noise caused by square shaped cross bars.

 

Mine dropped significantly aswell around 2-3mpg

*Mind you, this is with my ski racks on there currently

 

We have a couple of roof racks, one with a front panel that always costs a couple mpgh and one with only rails that its hard to see much effect on mpg unless its at interstate speeds or loaded with stuff that makes it equivalent to a front panel. Its the area added to the frontal area that matters.

 

Well, after running the numbers I am at 38.5 without the rack and 30-32 with just the rack and no bike.

 

Got around 30-35mpg with loaded kayaks and a bike carrier last summer. Lots of trips to the ADK's. Without cargo, it was never over 37mpg.