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Old 03-23-2008, 11:43 PM   #2 (permalink)
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Location: Columbia, MO
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Harold - '94 Honda Civic CX
90 day: 54.51 mpg (US)

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Yes, it will improve your highway mileage.

The better question is: "Will it improve my mileage a noticeable amount?"

To that, my answer is: no, probably not. Unless your crossbars are ungodly huge, or you currently have something else attached to them (like a bike, cargo box, etc.)
"I got 350 heads on a 305 engine. I get 10 miles to the gallon. I ain't got no good intentions." - The Drive By Truckers.

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