You might want to consider Yakima Whispbars, which are designed to reduce wind noise and resistance. Much of the Prius' excellent gas mileage is due to its aerodynamic profile, and a roof rack will alter that. Roof racks are notorious for causing wind noise and reducing gas mileage. The downside to Whisbars is that they are more expensive, but the additional cost might be worthwhile if you value fuel economy and a quiet interior.
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