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Administrator, Resident Tater Salad
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Stuff on top of the car really hurts highway power (and mileage) as well. We used to pile stuff on the top of our Saab 900 on long trips - one year, as a big family, we packed far too much and the roof rack was so un-aerodynamic that the car just couldn't do over 60-65 on the highway, foot to the floor. The weight of 5 people + a full trunk and <100 HP left in the old engine probably didn't help either.

The Yakima roof carrier has the same effect on a Jeep as well (when empty) at 70+ MPH.
 
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