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Discussion Starter · #1 ·
Just wondering what kind of fuel consumption penalty we get for things like roof rails. I know the Forester isn't very slick anyway, but would roof rails or racks make a significant difference?
 

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99 UK S-turbo
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8,566 Posts
Or at least enoygh difference to drop it by enough that it falles by 1mpg, as you have no decimal places it could be just 0.1mpg better!

Rough rails, about 0.2 'counts' or 0.002 on the Cd figure as a best guess from our aerodynamicist at work.

Decent front airdam and lip was what he suggested for my SF.

Simon
 

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2015 XC diesel CVT
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4,053 Posts
I was being broad. Have a look on S-UK for the figures *with* decimal places...
But I gotta reckon the rotating mass of the rims is the big part of the difference as the Urban is worse as well as the Extra-urban.
 
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