Quote:
Originally Posted by sustainable sam
I would avoid a roof rack at all costs. I used one for a recent trip and took a 15 to 20% hit in mileage.
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My own not very rigorous test:
With bike inside (no racks):
55 MPG @ 55 MPH
With bike on roof racks:
40 mpg @
55 MPH = down
15 mpg or -27%
From:
Mini-experiment: the wrath of roof racks - MetroMPG.com