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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.)
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"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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